
DIFFERENCE OF RELATIVE SDName:
with s and \( \bar{x} \) denoting the standard deviation and mean, respectively. Some analysts prefer to call this the percent relative standard deviation and the value obtained without multiplying by 100 the relative standard deviation. If this is your preference, simply divide the obtained value by 100 with the LET command. This differs from the coefficient of variation in that the absolute value of the mean is taken and the value is expressed as a percentage. For the difference of relative standard deviations, the relative standard deviation is computed for each of two samples then their difference is taken.
<SUBSET/EXCEPT/FOR qualification> where <y1> is the first response variable; <y2> is the first response variable; <par> is a parameter where the computed difference of the relative standard deviations is stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
LET A = DIFFERENCE OF RELATIVE SD Y1 Y2 SUBSET X > 1
SKIP 25 READ IRIS.DAT Y1 TO Y4 X . LET A = DIFFERENCE OF RELATIVE SD Y1 Y2 TABULATE DIFFERENCE OF RELATIVE SD Y1 Y2 X . XTIC OFFSET 0.2 0.2 X1LABEL GROUP ID Y1LABEL DIFFERENCE OF RELATIVE SD CHAR X LINE BLANK DIFFERENCE OF RELATIVE SD PLOT Y1 Y2 X CHAR X ALL LINE BLANK ALL BOOTSTRAP DIFFERENCE OF RELATIVE SD PLOT Y1 Y2 XDataplot generated the following output. *********************************************** ** LET A = DIFFERENCE OF RELATIVE SD Y1 Y2 ** *********************************************** THE COMPUTED VALUE OF THE CONSTANT A = 0.85294724E01 ************************************************** ** TABULATE DIFFERENCE OF RELATIVE SD Y1 Y2 X ** ************************************************** * Y1 AND Y2 X * DIFFERENCE OF RELATIVE SD ********************************************** 1.00000 * 4.01654 2.00000 * 2.63285 3.00000 * 1.19178 GROUPID AND STATISTIC WRITTEN TO FILE DPST1F.DAT  
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Date created: 03/27/2003 