This is one of those, "I knew how to do it in the other program, but how to in SAS" questions. I need to do a Wilcoxon Mann-Whitney test. The data comes as; SUBJ TIME TEST 01 1 3.4 01 2 3.5 02 1 2.4 02 2 3.5 In the pasT, I would explain transpose a wide format, like this. SUBJ TEST_1 TEST_2 01 3.4 3.5 02 2.4 3.5 Then I write my wilcoxon to compare TEST_1 to TEST_2, which is sort of like (TEST_2 - TEST_1=DIFF). But SAS seems to want to use the first data structure. It wants me to use a VARIABLE and a CLASS, (with only 2 values in the CLASS column.) How do I write the procedure so I can ensure that the order of operations is going the right way, as in, that I'm subtracting TEST_1 from TEST_2 and not the other way around? I used the documentation from the NPAR1WAY to get some results, but I don't feel that I'm getting the same info I'm used to. Here is a sample of my code. ods graphics on; proc npar1way data=my.data plots=all; where time=1 or time=2; var test; class time; run; ods graphics off; I am comparing TIME1 against TIME2. I guess my question is partly statistical. Does the p-value consider the result as an absolute result, not caring if the difference was positive or negative? The Null Hypothese says they are equal, so whether the difference is good or bad, doesn't really show in the p-value. Thanks in advance.
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