IWECDF
Name:
Type:
Purpose:
Compute the standard form of the inverted Weibull cumulative
distribution function with tail length parameter
.
Description:
The standard form of the inverted Weibull cumulative distribution
function is:
Syntax:
LET <y2> = IWECDF(<y1>,<GAMMA>)
<SUBSET/EXCEPT/FOR qualification>
where <y1> is a variable, number, or parameter;
<y2> is a variable or a parameter (depending on what
<y1> is) where the computed inverted Weibull cdf
value is stored;
<GAMMA> is a positive number or parameter that
specifies the tail length parameter;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.
Examples:
LET A = IWECDF(3,2)
LET A = IWECDF(A1,4)
LET X2 = IWECDF(X1,8)
Note:
The general form of the inverted Weibull cumulative distribution
function is:
where is the
location parameter and
is the scale
parameter.
Default:
Synonyms:
Related Commands:
IWEPDF

= Compute the inverted Weibull probability density
function.

IWEPPF

= Compute the inverted Weibull percent point function.

WEIPDF

= Compute the Weibull probability density function.

GAMPDF

= Compute the gamma probability density function.

CHSPDF

= Compute the chisquare probability density function.

NORPDF

= Compute the normal probability density function.

LOGPDF

= Compute the lognormal probability density function.

PPCC PLOT

= Generate a PPCC plot.

PROBABILTY PLOT

= Generate a probability plot.

RANDOM NUMBERS

= Generate random numbers.

Reference:
"Continuous Univariate Distributions: Volume 1", 2nd. Ed.,
Johnson, Kotz, and Balakrishnan, 1994, John Wiley, pp. 693.
Applications:
Implementation Date:
Program:
MULTIPOT 2 2
MULTIPLOT CORNER COORDINATES 5 5 95 95
MULTIPLOT SCALE FACTOR 2
LABEL CASE ASIS
Y1LABEL Probability
Y1LABEL DISPLACEMENT 12
X1LABEL X
TITLE IWECDF (GAMMA = 0.5)
PLOT IWECDF(X,0.5) FOR X = 0.01 0.01 5
TITLE IWECDF (GAMMA = 1)
PLOT IWECDF(X,1) FOR X = 0.01 0.01 5
TITLE IWECDF (GAMMA = 2)
PLOT IWECDF(X,2) FOR X = 0.01 0.01 5
TITLE IWECDF (GAMMA = 5)
PLOT IWECDF(X,5) FOR X = 0.01 0.01 5
END OF MULTIPLOT
Date created: 10/9/2001
Last updated: 4/4/2003
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alan.heckert@nist.gov.
