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st: Loop to compare several variables within different timepoints


From   Nikolaos Pandis <nikpandis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Loop to compare several variables within different timepoints
Date   Sun, 2 Feb 2014 12:38:44 +0200

I have about 25 variables for  which I recorded outcomes at 3 times
points (t1, t2, t3)
I  would like to construct a loop where I can automate testing using
the "signrank" test

I would like to do the following:

signrank a1=a2
signrank b1=b2
signrank c1=c2
.....
signrank a3=a2
signrank b3=b2
signrank c3=c2
..............

a,b,c are the variables and 1,2,3 refer to the timepoints

I am only interested in 25*2=50 comparisons and not to compare
different letter variables between them. Only within the same
variables to compare between timepoints.

Any help would be appreciated.

Thank you,

Nick
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