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I would like to obtain LSMeans comparisons for the within-subject factors of a repeated measures model using GLM.

Here is an example

proc glm;
   class Drug;
   model result1 result2 result3 result4 = Drug; 
   repeated Time 4 ;
   lsmeans Time;
run;

The above example doesn't work because the variable time doesn't exist. Is there another way to get the comparisons using proc GLM or do I have to transform my data to long format and use proc Mixed ?

Thank you for your help!

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