Troubleshooting
Problem
I have a data file with the variables "pre" and "post" in it, and want to produce a paired samples t-test with the mean difference computed by subtracting the pre score from the post score. When I click on Analyze->Compare Means->Paired Samples T Test, no matter which order I use in clicking on the variables, the pair is always put into the Paired Variables box as "pre -- post" and the resulting mean difference is always pre minus post. How can I get SPSS to give me post minus pre?
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Historical Number
19381
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Document Information
Modified date:
16 June 2018
UID
swg21476711