
DIFFERENCE OF MEANName:
For the difference of means, the mean 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 means is stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
LET A = DIFFERENCE OF MEAN Y1 Y2 SUBSET X > 1
SKIP 25 READ IRIS.DAT Y1 TO Y4 X . LET A = DIFFERENCE OF MEAN Y1 Y2 TABULATE DIFFERENCE OF MEAN Y1 Y2 X . XTIC OFFSET 0.2 0.2 X1LABEL GROUP ID Y1LABEL DIFFERENCE OF MEANS CHAR X LINE BLANK DIFFERENCE OF MEAN PLOT Y1 Y2 X CHAR X ALL LINE BLANK ALL BOOTSTRAP DIFFERENCE OF MEAN PLOT Y1 Y2 XDataplot generated the following output. **************************************** ** LET A = DIFFERENCE OF MEAN Y1 Y2 ** **************************************** THE COMPUTED VALUE OF THE CONSTANT A = 0.27860000E+01 ******************************************* ** TABULATE DIFFERENCE OF MEAN Y1 Y2 X ** ******************************************* * Y1 AND Y2 X * DIFFERENCE OF MEANS ********************************************** 1.00000 * 1.57800 2.00000 * 3.16600 3.00000 * 3.61400 GROUPID AND STATISTIC WRITTEN TO FILE DPST1F.DAT  
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Date created: 03/21/2003 