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Change Log for the Handbook

Introduction This page documents changes made to the online version of the Handbook.

The initial publication of the CD of the Handbook was generated from the 6/2003 version. We do not document changes made before this date.

Subsequent printings of the CD will incorporate changes documented here. We will list print dates for the CD. If your copy of the Handbook CD does not contain a print date, then it is from the initial 6/2003 printing.

July 2017 Changes The following changes were made in June, 2017.
  1. On page pri542.htm, added the line "0 0.333 0.667" to Table 5.3.

June 2017 Changes The following changes were made in June, 2017.
  1. On page prc262.htm, added a short paragraph to help clarify the definition of percentile.

  2. On page mpc3671.htm, the R script implementing the example inadvertently skipped the first line in the data file. As a result, most of the output values on the page had to be updated as well. Also included a link to a Dataplot script (in addition to the R script) for performing the calibration analysis.

  3. On page mpc3673.htm, added a link to a Dataplot script for performing the calibration analysis.

May 2017 Changes The following changes were made in May, 2017.
  1. On page eda35b.htm, made a correction to the formula for the adjusted Fisher-Pearson skewness coefficient.

  2. On page mpc55.htm, corrected a typo in the propogation of error formula equation.

April 2017 Changes The following changes were made in April, 2017.
  1. On page apr412.htm, changed "MLE's" to "MLEs" in several places.

February 2017 Changes The following changes were made in February, 2017.
  1. On page prc46 changesd the title from "Do all the processes have the same proportion of defects" to "Do all the processes have the same proportion of defectives?".

January 2017 Changes The following changes were made in January, 2017.
  1. On page prc32 in the "Caution on looking up critical values" section, the second list item reversed the equations for "nu1 = N1 - 1" and "nu2 = N2 - 1" when converting from GIF files to MathJax. This was corrected.

  2. On page ppc431.htm, fixed a broken link.

November 2016 Changes The following changes were made in November, 2016.
  1. On all pages, the javascript code to collect usage statistics was modifed. This should have no effect on the content of the pages.

  2. The method for exit scripts (i.e., for links that leave the NIST web pages) was modified to use JavaScript code (the CGI script that was previously used is no longer available). This should have no effect on the content of the pages.

    Cerain pages use "frames". The JavaScript exit code for these pages is incompatible with some of the frame code (i.e., we can have either the exit script or correct navigation back to the e-Handbook page, but currently not both). The exit script code was removed on these pages.

    The new exit script code to the Sematech page in the navigation bar does not currently work. Therefore the exit script code was removed.

  3. The acknowledgements page was updated to remove dead links and to correct the links to NIST pages to reflect the new Drupal content management system.

October 2016 Changes The following changes were made in October, 2016.
  1. On page eda3672, modified some labeling on the graph of the t pdf function. Specifically, changed the "alpha = 0.05" labels to "alpha/2 = 0.025".

September 2016 Changes The following changes were made in September, 2016.
  1. In search.htm, the search engine was changed from Google Search Appliance to DigitalGov.

May 2016 Changes The following changes were made in May, 2016.
  1. On page apr166, in the formula for the Birnbaum-Saunders PDF function, changed two occurences of "u" to "\mu".

February 2016 Changes The following changes were made in February, 2016.
  1. On page eda331 (autocopl), added a paragraph clarifying that "uncorrelated" does not necessarily mean "non-random".

  2. On page mpc552, corrected the covariance term in the Y = XBAR/YBAR formula.

January 2016 Changes The following changes were made in January, 2016.
  1. Corrected a broken link on page ppc45.htm.

  2. On page eda35b, for the description of kurtosis, changed "peaked" and "flat" to "heavy-tailed" and "light-tailed".

  3. On page eda361, there was some re-wording of the last section for better clarity.
December 2015 Changes The following changes were made in December, 2015.
  1. Corrected a typo in the formula for the multivariate normal pdf (changed a "rho" to a "p").

November 2015 Changes The following changes were made in November, 2015.
  1. The file "Rcode/ppc511.r was updated to include analysis for pages ppc512.htm and ppc513.htm (this is the Furnace data case study).

October 2015 Changes The following changes were made in October, 2015.
  1. On page pmc42.htm for the "Table showing squared error for the mean for sample data", two entries in the "Mean" column were changed from 48.676 to 48.776.

  2. On page prc32.htm, the wrong standard deviation was used for sample 2 which resulted in the wrong value for the test statistic. This was corrected.
June 2015 Changes The following changes were made in June, 2015.
  1. The MathJax updates to sections 5 and 6 of the mpc chapter seemed to have gotten overwritten. These were restored.

May 2015 Changes The following changes were made in May, 2015.
  1. In the example on page prc241.htm, change value for phat from 0.013 to 0.13.

  2. In a number of case studies in the EDA chapter, the report for the test of normality stated that the test was based on the Anderson-Darling test. It was in fact based on the PPCC test. The fix was to augment the report to include both the PPCC and the Anderson-Darling tests.

    The Dataplot macros for the distributional tests were also updated. Note also that Dataplot changed the way Anderson-Darling tests are implemented. The macros were updated to incorporate this change.

April 2015 Changes The following changes were made in April, 2015.
  1. Updated the section on non-parametric capability indices in page pmc16.htm. Added two references related to this in page pmc7.htm.

  2. The MathJax equations were not being rendered with IE 9 and below. Changed the config option on all pages that load the MathJax Javascript code. Specifically, changed "config=TeX-AMS-MML_HTMLorMML" to "config=default.js".

  3. On page pri3323.htm, fixed a typo (in the last table, changed E31 to E13).

February 2015 Changes The following changes were made in February, 2015.
  1. Made some modifications on page prc262.htm. Specifically, referenced various definitions for percentiles to the Hyndman and Fan American Statistician article (the two basic methods described correspond to R6 and R7 in the article). Added the R8 method as this is the one advocated by the article to be the "standard" definition. Added the article to the References page (prc5.htm).

January 2015 Changes The following changes were made in January, 2015.
  1. Corrected a typo in the formula for the SSe sum of squares (removed the "J" before summations).

December 2014 Changes The following changes were made in December, 2014.
  1. The formulas for SSE and SST were corrected on pages ppc231.htm, ppc232.htm, and ppc233.htm. Note that this corrects an error that was introduced when converting the equations to MathJax. Specifically, removed the bar from the yij and yijk terms.

  2. On page eda35b.htm, made some updates to the formulas for skewness and kurtosis. Also expanded the discussion of skewness.
September 2014 Changes The following changes were made in September, 2014.
  1. The URL for the MathJax web site (for rendering equations) was changed. All pages that used MathJax were modified to use the new URL. This did not involve any substantive changes.

August 2014 Changes The following changes were made in August, 2014.
  1. In pages eda33l.htm and eda33m.htm, added a link to the reference section for Filliben's 1975 Technometrics paper.

  2. Fixed a typo in page prc5.htm.

  3. On page ppc232, corrected the formula for the interaction term in the first table (the grand mean should be added rather than subtracted).

July 2014 Changes The following changes were made in July, 2014.
  1. Equations in chapter 5 (pri) have been converted to MathJax. In addition, some minor editorial updates were made to these sections.

  2. On page prc31.htm, the Welch-Satterthwaithe formula for degrees of freedom was corrected (note that it was previously correct and the conversion to MathJax introduced an error).

June 2014 Changes The following changes were made in June, 2014.
  1. Equations in chapters 7 (prc) have been converted to MathJax.

May 2014 Changes The following changes were made in May, 2014.
  1. Equations in chapters 8 (apr) have been converted to MathJax.

  2. On page pmc422, corrected an entry in table 1 to be consistent with the computation performed in table 2.
March 2014 Changes The following changes were made in March, 2014.
  1. Equations in chapters 3 (ppc), 4 (pmd) and 6 (pmc) have been converted to MathJax.

  2. On page eda3669, made some clarifications to the description on the lognormal pdf (specifically, made explicit the relationship to the popular parameterization mu = exp(m)).

  3. On page eda354, modified the R script to use the "aov" rather than the "lm" command to perform the analaysis of variance. This corrected a problem with the degrees of freedom.
January 2014 Changes The following changes were made in January, 2014.
  1. The R script ppc511.r was corrected.

  2. On page prc241.htm, clarified that the method described is actually commonly referred to as the Wilson method and that a method described in Brown, et. al. is commonly referred to as the Agresti-Coull method.

November 2013 Changes The following changes were made in November, 2013.
  1. Equations in the e-Handbook are currently rendered as GIF files (these were originally created using either LaTex or Word. We are currently replacing these with MathJax. MathJax uses JavaScript to render inline LaTex equations. Chapters 1 and 2 have now been updated on the public site. Related to this, most stand alone occurrences of Greek characters are now rendered using HTML syntax (e.g., α) rather than as GIF files (GIF files were used in the original e-Handbook pages due to the fact that some of the popular browsers did not yet support the HTML Greek characters). Again, this conversion is completed for Chapters 1 and 2. Some minor editiorial updates were made to Chapter 1.

  2. A small bit of JavaScript code has been added to all of the HTML pages. This JavaScript code is being used by NIST to genrate web page usage statistics for NIST. It involves no substantive change in the e-Handbook.

  3. On page prc312, corrected the formula for the unpaired observations, unequal variances case.

  4. On page pmc42, there was an error in computing the mean for the net income example. This error propogated to the other values in the table and to the final MSE. Corrected the mean value, the error and squared error columns, and the final MSE.

  5. Created a directory, Rcode, to contain the R codes and associated data files used in the e-Handbook. Under Tools & Aids page there is a link to "Statistical Software". This page (dataplot.htm) contains a link to the R web site. In this section, I added a link to a zip file that contains the contents of the Rcode directory.

  6. Fixed a typo in an equation (changed 2*SQRT(16) to 3*SQRT(16)).

  7. On page pmc324, fixed some typos in the "EWMA statistics" table (changed 49.12 to 49.21, 49.34 to 49.38, and added the last entry 51.99).
May 2013 Changes The following changes were made in May, 2013.
  1. The April 2013 fix for page pmc32.htm was actually incorrect. Changed back to the original formula. However, added an explanatory section that C4 often given in terms of the reciprocal.

April 2013 Changes The following changes were made in April, 2013.
  1. On page pmc32.htm, corrected the equation for c4 (changed SQRT(2/(n-1)) to SQRT((n-1)/2).

March 2013 Changes The following changes were made in March, 2013.
  1. On page pmc421.htm, the MSE changed from 2.018 to 2.42 (should divide by 10 rather than 12).

  2. The 4/2009 update for page prc242.htm was mistakenly copied to prc243.htm. Moved prc243.htm to prc242.htm.

  3. Fixed a typo for the equation for the test statistic for the chi-square variance test on page eda358.htm.

  4. On page pmc552.htm, an entry in one of the matrices (the B = V*L**(-1/2)) was incorrect.

February 2013 Changes The following changes were made in February, 2013.
  1. Fixed a typo on page ppc511.htm.

December 2012 Changes The following changes were made in December, 2012.
  1. Corrected the moving average model to include the moving average term.

November 2012 Changes The following changes were made in November, 2012.
  1. Removed references to SEMPLOT on pmc44.htm.

  2. Fixed broken link to Box-Ljung test on page pmc_d.htm.

  3. Corrected typo on page pmc231.htm.

  4. Added a link to R code on page pmc44a.htm.

October 2012 Changes The following changes were made in October, 2012.
  1. Fixed a broken link on page ppc134.htm.

  2. In the macros prc241.r and prc241.dp, changed the "20" in the binomial cdf calls to "n" (which is defined previously in the macro).

July 2012 Changes The following changes were made in July, 2012.
  1. The citation to Neter, Wasserman, and Kutner corrected a typo for Kutner on pages eda355.htm and eda43.htm.

  2. On page prc16.htm, changed Q2 to Q3 when referring to the upper quartile.
June 2012 Changes The following changes were made in June, 2012.
  1. The eda35e.r file was updated. For reproducibility, an explicit seed is set before generating each set of random numbers. In addition, some comments were added in regards to the Cauchy distribution warning that numerical issues are possible in some cases.

April 2012 Changes A significant update was made in April, 2012. An effort was made to make some of the content more software neutral. In addition, in most of the examples and case studies where Dataplot scripts were provided, links are now also provided to scripts using the open source R statistical software program. Numerous other minor edits were also made.
March 2012 Changes The following changes were made in March, 2012.
  1. On page mpc622.htm, corrected the s1 value from 0.04054 to 0.06139.

December 2011 Changes The following changes were made in December, 2011.
  1. On page eda362.htm, commented out a sentence in regard to the cumulative hazard function.

July 2011 Changes The following changes were made in July, 2011.
  1. Fixed two typos on page eda35.htm.

June 2011 Changes The following changes were made in June, 2011.
  1. On page eda33l.htm, the links for "short" and "fat" tails cases were reversed. Corrected this.

May 2011 Changes The following changes were made in May, 2011.
  1. On page mpc321.htm, clarified that the table of relative efficiencies of R versus S is really the relative efficiencies of R versus S/c4. This modification is based on Mahmoud, Henderson, Epprecht, and Woodall (2010), "Estimating the Standard Deviations in Quality-Control Applications," Journal of Quality Technology, pp. 348-357, Vol. 42, No. 4.

April 2011 Changes The following changes were made in April, 2011.
  1. On page eda35d.htm, corrected a broken link to page pmd142.htm.

March 2011 Changes The following changes were made in March, 2011.
  1. On page apr161.htm, the example formulas for lambda = 0.01 for EXPPDF and EXPCDF where modified to change the parameter from 0.01 to 100 (Dataplot uses the scale parameter which is 1/lambda).

  2. On page pmc322.htm, in the table for "Example of moving range" the third value in the moving range columns was changed from 14 to 1.4.

  3. On page eda33o.htm(qqplot.htm), modifed a sentence in the Purpose section.

February 2011 Changes The following changes were made in February, 2011.
  1. The "airplane glass failure time" case study has been replaced with the "Fatigue Life of Aluminum Alloy Specimens" case study in the EDA chapter (the "eda429x.htm" files).

  2. On page eda366a.htm, the name "fatigue life" was changed to "Birnbaum-Saunders" as the primary name (these in fact refer to the same distribution, however, the name Birnbaum-Saunders is more prevelant in the literature).

  3. On page eda33u.htm (and weibplot.htm), the values for the shape and scale estimates were reversed. In addition, added some additional text to specify how the shape and scale estimates are determined from the plot and to clarify the values on the x-axis.

  4. On page apr452.htm, corrected the equation for M(t) (M(t) = abt^b changed to at^b).

January 2011 Changes The following changes were made in January, 2011.
  1. On page eda33a8.htm (and histogr8.htm), corrected the value of the outlying point to 9.45 (from 4.5).

September 2010 Changes The following changes were made in September, 2010.
  1. On page pri33a.htm, there was a missing row in one of the tables (the unnumbered table betweem 3.38 and 3.39). This missing row was inserted.

August 2010 Changes The following changes were made in August, 2010.
  1. On page eda33l.htm (normprpl.htm), changed "m(i)" to "U(i)" in the definition of the median order statistics in order to make the notation consistent.

July 2010 Changes The following changes were made in July, 2010.
  1. Corrected the formula for the lognormal cumulative hazard function on page eda3669.htm.

  2. Corrected the link to the normal probability plot on page eda4292.htm.

  3. Corrected the link to the normal probability plot on page pri598.htm. Also corrected a formatting problem on this page where a "bold" specification was not ended correctly.

June 2010 Changes The following changes were made in June, 2010.
  1. The section on univariate outliers was substantially modified. The page eda35h.htm was completely rewritten and three new pages were added (eda35h1.htm, eda35h2.htm, and eda35h3.htm). Updates were made to eda35.htm, eda43.htm, and eda44.htm to reflect the new material.

  2. The link to the "privacy policy" on the main page was changed to reflect its new location.

  3. Made a few edits to page pmc544.htm.
March 2010 Changes The following changes were made in March, 2010.
  1. Fixed typos on pages eda3312.htm and eda3313.htm (specifically, changed "randomness" to "non-randomness" in the Recommended Next Step section).

  2. Fixed a typo on page eda356.htm (in Double Exponential Distribution section, changed "extremes fall about 12 standard deviations" to "extremes fall about 6 standard deviations".

February 2010 Changes The following changes were made in February, 2010.
  1. On page mpc233.htm, fixed a typo that caused the last paragraph to be formatted incorrectly.

  2. On page eda338.htm, corrected the statement "If the slope of the complex demodulation plot is zero" to "If the slope of the complex demodulation plot is not zero".

  3. On page pmc231.htm, fixed the links for the "Previous" and "Next" buttons at the bottom of the page.

  4. On page index2.htm, removed the link to the Department of Commerce Technology Administration (just links to Department of Commerce).

  5. On page ppc333.htm, changed "10%" to "10 angstroms".

  6. On page pmc16.htm, fixed the equation m <= MU <= LSL to m <= MU <= USL.

January 2010 Changes The following changes were made in January, 2010.
  1. On page pri596.htm, a typo was fixed that caused several paragraphs to appear as bold when only a single word was supposed to be bold.

December 2009 Changes The following changes were made in December, 2009.
  1. On page pri42.htm, refined a link (the link went to the correct page, but modified it to go to the appropriate section).

November 2009 Changes The following changes were made in November, 2009.
  1. On page ppc331.htm, fixed a broken link.

  2. On page eda35b.htm, made some modifications to the text distinguishing between kurtosis and excess kurtosis.

September 2009 Changes The following changes were made in September, 2009.
  1. On page prc222.htm, fixed a broken link.

  2. On page prc24.htm, fixed a broken link.
October 2009 Changes The following changes were made in October, 2009.
  1. On page eda4212.htm, fixed a broken link.

July 2009 Changes The following changes were made in July, 2009.
  1. Corrected a grammatical error on page pmc31.htm.
April 2009 Changes The following changes were made in April, 2009.
  1. Rewrote page prc243.htm. New page based on pages 30-34 of Fleiss, Levin, and Paik (Third Edition). Also added the Fleiss, Levin, and Paik to the references in prc5.htm.
February 2009 Changes The following changes were made in February, 2009.
  1. Fixed a typo on page apr215.htm (a K-S was changed to K-M).
December 2008 Changes The following changes were made in October, 2008.
  1. Changed the partial autocorrelation plot on page pmc622.htm. It was showing the partial autocorrelation plot for the raw data, not the differenced data.
October 2008 Changes The following changes were made in October, 2008.
  1. On page prc16.htm, the wrong value for the interquartile range was used in computing the lower and upper fence values. This was corrected.

  2. Fixed a typo on page pri521.htm.

September 2008 Changes The following changes were made in September, 2008.
  1. On page pri5363.htm, there was a typo in table 3.26. For the Box-Behnken design, the X3 for sequence 1 was changed from a 10 to a 15.

May 2008 Changes The following changes were made in May, 2008.
  1. On page pri5322.htm, the best solution for Y2 was changed from 157.1 to 1571.05 (this was a typo).

March 2008 Changes The following changes were made in March, 2008.
  1. Corrected the spelling of Springer-Verlag on page pmc7.htm.

  2. Corrected a link for one of the SEMSTAT files.
February 2008 Changes The following changes were made in February, 2008.
  1. Fixed a typo on page eda33q.htm.

December 2007 Changes The following changes were made in December, 2007.
  1. On page prc7.htm, corrected the volume number for the Ljung and Box Biometrika paper.

October 2007 Changes The following changes were made in October, 2007.
  1. On page prc24.htm, fixed the link to the binomial distribution (it was going to the beta distribution).

September 2007 Changes The following changes were made in September, 2007.
  1. On page pmc435.htm, the formula in "step 1" for the yearly averages (A(p)) did not divide by the number of periods. Corrected the equation.

  2. Corrected the spelling for George Kaupas (author of the Course Builder software) on the acknowledgements page and on the toolaids/cb/index.htm page.

  3. On page eda35b.htm, reworded the section on the definition of kurtosis.
July 2007 Changes The following changes were made in July, 2007.
  1. On page pmc3231.htm, fixed a typo in the first equation (the S(r) for the standardized case was missing the "- k").

June 2007 Changes The following changes were made in June, 2007.
  1. On page prc263.htm, fixed a mistake in the Dataplot macro for obtaining the k-factor for one-sided tolerance intervals. Also rewrote the text for this section.

May 2007 Changes The following changes were made in May, 2007.
  1. On page ppc333.htm, in the last paragraph, changed "10%" to "10 angstroms".

  2. On page pmc625.htm, several of the Dataplot macros were in the wrong directory and so were not found when the user initiated the link. The macros were moved to the correct directory.

April 2007 Changes The following changes were made in April, 2007.
  1. On page prc3.htm, there was no link to page prc35.htm (as there was to the other four sections). Added the appropriate link.

March 2007 Changes The following changes were made in March, 2007.
  1. On page mpc3321.htm, the h matrix should have been divided by (1/6) (i.e., 0.5 instead of 3). Corrected this and the resulting change in the computation of the B vector.

  2. On page prc263.htm, added a Dataplot macro for obtaining a more accurate approximation for the k-factor for one-sided tolerance intervals.
February 2007 Changes The following changes were made in February, 2007.
  1. On page pri8.htm, corrected the reference for Miller's Technometrics paper.
January 2007 Changes The following changes were made in January, 2007.
  1. On page eda35h.htm, fixed two typos.

December 2006 Changes The following changes were made in December, 2006.
  1. On page apr312.htm, the link to lot acceptance sampling plans was incorrect. Fixed this link.

September 2006 Changes The following changes were made in September, 2006.
  1. On page apr164.htm, modified the section that demonstrated the Dataplot commands for the lognormal distribution.

  2. Since International SEMATECH no longer makes SEMSTAT available on its web pages, we will make the software available on the NIST site (note that NIST does not and will not support SEMSTAT). The page dataplot.htm was modified to include links to the SEMSTAT software.

    In addition, the links to SEMSTAT in pages apr452.htm, pmc449.htm, pmc44a.htm, and prc241.htm were modified to point to the NIST location rather than the International SEMATECH location.

August 2006 Changes The following changes were made in August, 2006.
  1. On page pri331.htm, added a sentence clarifying i and j in Y(ij).

  2. On page apr451.htm, modified the paragraph describing the use of the CHSPPF function in Dataplot and the CHIINV function in Excel for computing the confidence interval. This was an editorial change to provide better clarity.
July 2006 Changes The following changes were made in July, 2006.
  1. On page eda3662.htm, we modified the description of the maximum likelihood estimators for the uniform distribution.

  2. On page pmc332.htm, fixed a typo in an equation (phat(i) = D - i/n was changed to phat(i) = D(i)/n).

  3. On page ppc46.htm, fixed a broken link to the process capability section.

  4. On page eda33u.htm, fixed a typo for the Weibull plot description (changed ln-ln(1-p) to ln(-ln(1-p)).

  5. On page pri33a.htm, the L36 design was incorrect. Corrected 5 columns in row 33 of this design.
June 2006 Changes The following changes were made in June, 2006.
  1. Fixed a typo on page pmc22.htm (a "the the" was corrected to "the").

April 2006 Changes The following changes were made in April, 2006.
  1. Fixed a broken link on page prc32.htm.

  2. Fixed a broken link on page ppc32.htm.

  3. On page eda35b.htm, rewrote the sentences describing left and right skewness.

  4. On pages ppc332.htm and prc473.htm, fixed the "Back" and "Next" buttons at the bottom of the page.

  5. On pages pmc16.htm, replaced the graph showing Cp for varying process widths (the 1.33 and 1.66 plots were reversed). Also changed the sentence

    A capable process is one where almost all the measurements fall inside the specification limits.

    to

    A process where almost all the measurements fall inside the specification limits is a capable process.

  6. For the plots of probability density functions in section 3 of the EDA chapter, the y-axis label was changed from "Probability" to "Probability Density".

  7. Changed the deflection value shown on the plot on page pmd61a.htm to be 1.239722 instead of 1.239723 to match the number used in the text.

  8. Updated the printer-friendly files on the e-Handbook web site to the latest version of pdf files (May 1, 2006).

  9. Updated the printer-friendly files on the e-Handbook web site to include pdf files for all eight chapters.
February 2006 Changes The following changes were made in February, 2006.
  1. On page pri4.htm, the link to the chapter 3 ANOVA was incorrect. It was changed to go to the correct page.

  2. The Back and Next links at the bottom of page prc473.htm were not working correctly. These were fixed.

  3. On page apr221.htm, changed "linear in log(x)" to "linear in x".
January 2006 Changes The following changes were made in January, 2006.
  1. Changed the link associated with the text "lack-of-fit test" on page pmd44.htm to point to the page pmd446.htm rather than the page pmd442.htm.

December 2005 Changes The following changes were made in December, 2005.
  1. In Table 3.30 on page pri3364.htm, the alpha value was computed incorrectly. The value was changed from 1.681793 to 1.63299.

November 2005 Changes The following changes were made in November, 2005.
  1. The link for "effects" in the Analysis of Variance definition in the glossary was fixed.

September 2005 Changes The following changes were made in September, 2005.
  1. Links for "Design new experiment." and "Collect data." were added to the flowchart outlining the development of a process model in the Engineering Questions page. The link for "New model describes the data well?" was deleted since that is a simply a branch point.

  2. Corrected several symbols to match the fractionation of the design with the correct resolution on page pri3344.htm.

  3. On page pri3364.htm, removed the leading "+" sign from the "Block" column of table 3.29 to be consistent with the other tables on that page.

  4. On page prc473.htm, changed the formulation of the degrees of freedom in the example for the Bonferroni simultaneous confidence interval from "4" to "2*2" to make clearer the "2*g" source of the "4".
August 2005 Changes The following changes were made in August, 2005.
  1. The link on page pmc321.htm to Galit Shmeli's quality control web site was not working correctly. This was corrected.

  2. On page eda35a.htm, it was not clear which version of the Levene test that Dataplot was performing. The Dataplot code was modified to include a line in the title of the output indicating which variant of the test is being performed. Added a clause on page eda35a.htm to indicate that the default in Dataplot is to perform the median based test.

  3. On page apr172.htm, fixed the equations nhpp3.gif and nhpp4.gif.

  4. On page eda35g.htm, corrected the test statistic for the Kolmogorov-Smirnov goodness of fit test. Also, added a note explaining the difference between the old and new formulas.
June 2005 Changes The following changes were made in June, 2005.
  1. Page pmc32.htm contained a typo in the Fractional Factorials defintion. This actually encoded an equation, a line of text, and another image as a single image (the typo was in the line of text). This was modified by breaking the single image into two separate images for each of the equations and entering the text line as regular text (with the typo corrected).

  2. Fixed broken links on pages ppc231.htm and ppc2311.htm.

  3. Fixed typo on page prc13.htm.

  4. On page prc14.htm, fixed the link to the standard normal table and fixed the bottom navigation links.

  5. On page prc15.htm, fixed the bottom navigation links.

  6. On page prc31.htm, fixed the bottom navigation links.

  7. On page pmc541.htm, added links to the formulas for the mean and variance and added the formula for the covariance. This was in response to a user request to include the computational formulas in order to work out the example for the variance-covariance matrix.

  8. On page prc242.htm, corrected the equation and the bottom of the page. Specifically, the value of delta in the numerator was changed from 0.15 to 0.10 (to reflect the text above) and the result was changed from 11 to 77.

  9. On page eda353.htm, rewrote the paragraph that described the formulation of the null hypothesis for the case where we are testing that the difference between the two means is equal to a constant. This was done to provide better clarity.
May 2005 Changes The following changes were made in May, 2005.
  1. Page prc16.htm contained an erroneous link for the median. This was corrected.

  2. Joseph Voelkel of the Rochester Institute of Technology pointed out that our formulation for the Grubbs test was in fact two distinct tests (one for the minimum and one for the maximum). This means that the significance level needed to be divided by 2 to obtain the correct critical values.

    Page eda35h.htm was updated to make the distinction between these one-sided and the two-sided tests explicit and to provide the correct formula for the critical values in each case. The Dataplot software was modified to produce correct critical values and to optionally print the one-sided tests.

April 2005 Changes The following changes were made in April, 2005.
  1. Page pmc231.htm contained a link to Galit Shmueli's web site for online quality control. Galit informed us that the site has been moved. The link was modified to point to the new site.

  2. Fixed some links on page pmc55.htm. Specifically, the "Goodman" link and the links on the bottom navigation bar were corrected.
March 2005 Changes The following changes were made in March, 2005.
  1. Updated dpbrows.htm to include instructions for configuring the Firefox browser to run Dataplot under Windows.

  2. On page 6.5.4.2, the formula for the multivariate normal distribution was incorrect. The corrected formula was inserted.

  3. Fixed typos on pages pmc.htm and pmc52.htm.

  4. Clarified the formula for the autocovariance function on page eda331.htm. Added a reference (to the Chatfield Time Series text) in eda43.htm.

  5. Fixed a typo in the title of page pmc4462.htm.

  6. The numerical example on page mpc3321.htm was originally computed using single precision. The calculations were redone using double precision. This slightly modified the values for Y'(I-XQX')Y, s1 and sitem3.

  7. On page apr164.htm, changed LET SD = .5 to LET SIGMA = .5.
January 2005 Changes The following changes were made in January, 2005.
  1. On page pmc435.htm, the equation for the initial values for the trend factor was missing some parenthesis. This caused some confusion in the meaning of the equation. A corrected version of the equation was inserted.

  2. Updated the printer-friendly files on the e-Handbook web site to the latest version of pdf files (January 26, 2005).
December 2004 Changes The following changes were made in December, 2004.
  1. On page eda3676.htm, the example gave the value for the 1% critical value rather than the 5% critical value. This was corrected.

  2. Page pri3347.htm links to a number of files containing various designs. The file containing the 29-4 design had incorrect values in the X9 column. This column was corrected.
November 2004 Changes The following changes were made in November, 2004.
  1. The link in the block plot page (eda333.htm) to the binomial distribution was going to the beta distribution. This was corrected.

  2. The sample Dataplot output for the Grubbs test (eda35h.htm) was corrected (the critical values were generated for a two-sided test when they should have been computed for a one-sided test).

  3. The Josephson junction cryothermometry case study (eda424.htm) was corrected to use all 5 columns of the data instead of just the first column. There were numerous changes in all pages of the case study.

  4. The case study (eda429.htm) was modified to incorporate some additional background information provided by Ed Fuller. The only substantive change was to replace the power lognormal with the fatigue life as one of the candidate distributions.
September 2004 Changes The following changes were made in September, 2004.
  1. NIST purchased their own web search engine . This replaces the FirstGov search engine that only allowed us to search the /www.itl.nist.gov/ web space rather than the restricted e-Handbook pages in /www.itl.nist.gov/div898/handbook/ web space. The new search software allows us to restrict the search to the /www.itl.nist.gov/div898/handbook/ web space.

  2. On page mpc36.htm, the sentence

      The loadcell measurements (shown as *) are plotted on the y-axis against the corresponding values of known load shown on the y-axis.

    was changed to

      The loadcell measurements (shown as *) are plotted on the y-axis against the corresponding values of known load shown on the x-axis.

July 2004 Changes The following changes were made in July, 2004.
  1. The example on page mpc3321.htm (section 3 of the MPC chapter) had an error in the A inverse matrix. This error propogated throughout the remaining computations on the page. Therefore significant edits were made to the example. In addition, some editorial corrections were made to the page.

  2. Page pri3347.htm links to a number of files containing various designs. The file containing the 28-3 design was incorrect and was replaced with the correct design. The resolution listed in the file containing the 27-3 was incorrect and was replaced with the correct resolution. The link to the 28-1 design listed the wrong resolution (the resolution given in the file was correct) and was corrected.
August 2004 Changes The following changes were made in August, 2004.
  1. The link on page eda3668.htm to Weibull maximum likelihood had a typo. This was corrected.
May 2004 Changes The following changes were made in May, 2004.
  1. Page ppc231.htm (section 2 of the PPC chapter) corrected two links in the "testing" paragraph.

  2. In section 3 of the MPC chapter, the gif files mpc352a.gif, mpc372a.gif, and mpc372b.gif seem to have corrupted for some unknown reason. This was causing some werid formatting in some of the probability distribution tables. Good copies of these gif files were restored.
March 2004 Changes The following changes were made in March, 2004.
  1. Page mpc365.htm (section 3 of the MPC chapter) corrected the value of F(.05,8,20).

  2. Corrected the formatting for the nu1 entries on the tables for the critical values of the F distribution on page eda3673.htm (section 3 of the EDA chapter).

  3. The link to the SEMSTAT program was changed to its new site. The pages dataplot.htm and prc241.htm were modified.

  4. Fixed a typo in page eda35e.htm (Anderson-Darling test).
November 2003 Changes The following changes were made in November, 2003.
  1. Page pmd134.htm (section 1 of the PMD chapter) had a broken link with the anchor text "central composite design". The link was corrected to point to pri3361.htm.

  2. Page pmd134.htm (section 1 of the PMD chapter) had a broken link with the anchor text "Chapter 5: Process Improvement". The link was corrected to point to pri.htm.

  3. Page pmd134.htm (section 1 of the PMD chapter) had a broken link with the anchor text "Section 6". The link was corrected to point to pri53.htm. The anchor text was changed to "Section 5.5.3".

  4. Page pmd141.htm (section 1 of the PMD chapter) had a link with anchor text "especially with respect to outliers" that pointed to the wrong page. The link was changed to point to pmd445.htm#nppi.

  5. Page dep/dep144.htm (under section 1 of the PMD chapter) had a missing graphic. The correct graphics file was added to pmd/section1/plots/.

  6. Page pmd442.htm (section 4 of the PMD chapter) had two typos in the first sentence in the second to last paragraph. "be adequately" was changed to "adequately" and "the the" to "the".

  7. Page dep/dep443b.htm (under section 4 of the PMD chapter) had a missing graphic. The correct graphics file was added to pmd/section4/plots/.

  8. Page pmd444.htm (section 4 of the PMD chapter) had a broken link with the anchor text "general discussion". The link was fixed by adding the correct section reference (section3). in the EDA chapter.

  9. Page pmd444.htm (section 4 of the PMD chapter) had a broken link with the anchor text "Process Monitoring". The link was fixed by adding the correct chapter reference (pmc) to the link address.

  10. Page pmd445.htm (section 4 of the PMD chapter) had a broken link with the anchor text "general discussion". The link was fixed by adding the correct section reference (section3). in the EDA chapter.

  11. Page pmd445.htm (section 4 of the PMD chapter) had a broken link with the anchor text "gallery of graphical techniques". The link was fixed by adding the correct section reference (section3) in the EDA chapter.

  12. Page pmd445.htm (section 4 of the PMD chapter) had a confusing sentence concluding the second paragraph.

    "Curvature or points that are far off the line indicate that the random errors are probably not normally distributed, or that the data has some outliers, in it respectively."

    was changed to

    "Distinct curvature or other signficant deviations from a straight line indicate that the random errors are probably not normally distributed. A few points that are far off the line suggest that the data has some outliers in it."

  13. Page pmd452.htm (section 4 of the PMD chapter) had four missing equation files. The missing files, sigmaeqg1.gif, sigmaeqg2.gif, sigmaeqmu.gif, and sigmaeqx.gif were copied back to the appropriate equations directory section4/eqns.

  14. Page howto.htm was not not interacting correctly with the navigation frame on the main pages of the e-Handbook. The links in howto.htm were changed so they opened new files in the primary browser window.

  15. Page acknwldg.htm was not not interacting correctly with the navigation frame on the main pages of the e-Handbook. The links in howto.htm were changed so they opened new files in the primary browser window. Affiliation links were also corrected for some authors.

  16. Page search.htm was not not interacting correctly with the navigation frame on the main pages of the e-Handbook. The link in navi.htm was changed so it opened search.htm in the primary browser window.

  17. Fixed several inconsistent links in the navigation bars on pages linked to from the main e-Handbook page and under "Tools & Aids".

  18. Added the page toolaids/cd.htm to provide information on the CD version of the e-Handbook. A link from the main page was added as well.
October 2003 Changes The following changes were made in October, 2003.
  1. Page apr311.htm (section 3 of the APR chapter) had a few errors. Specifically, the table entries for r=20 and confidence levels 90% and 95% were incorrect. The Excel formula was modifed to use 1 - alpha rather than alpha.

  2. Page eda3669.htm (section 3 of the EDA chapter) made a slight modification to the general pdf formula for better clarity.

  3. The Course Builder scripts are now available for download. Added links to both installation documentation and usage documentation for the Course Builder.

    Note that the Course Builder is not active on the NIST public web pages. Rather you need to install the e-Handbook on a local server and install and run Course Builder on this local platform.

September 2003 Changes The following changes were made in September, 2003.
  1. Updated the printer-friendly files on the e-Handbook web site to the latest version of pdf files (July 1, 2003).

  2. Fixed typos in the PPC chapter (ppc134.htm and ppc332.htm).

  3. The macro listed for the case study on page pmc625.htm (section 6 of the PMC chapter) contained an earlier version of the macro that was not aligned with the current version of the case study. The old macro was replaced with the new version.
  4. The formula for the multivariate normal distribution on page pmc542.htm (section 5 of the PMC chapter) was incorrect. The correct formula was inserted.
July 2003 Changes The following changes were made in July, 2003.
  1. In section 3 of the MPC chapter, page mpc365.htm contained links to pages mpc3653.htm and mpc3652.htm for the F-table and t-table. These pages are no longer part of the Handbook. The links were corrected to go to the F-table and t-tables in the EDA chapter.

  2. In section 5 of the MPC chapter, page mpc55.htm had a typo in a link. This was corrected.

  3. In section 5 of the PMC chapter, page pmc541.htm used both height and weight for one of the variable names. This was corrected to use height for all mentions of this variable.

  4. The wrong content for page mpc542.htm (in section 5 of the PMC chapter) was inadvertently inserted. This was replaced with the correct content.

  5. A typo was corrected in the Box-Cox sample data on page mpc52.htm (in section 5 of the PMC chapter).
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