Multiple comparisons in repeated measures

[Amanda_Lemon]

Hello -

I have a question about multiple comparisons in repeated measures. Specifically, I wanted to ask if in the example from the SAS documentation (see below) p-values are already adjusted for multiple comparisons, or if I need to apply adjustments myself (e.g., Bonferroni)?

proc mixed data=formixed; 
      class Person Gender age; 
      model y = Gender Age Gender*Age; 
      repeated Age / type=un subject=Person; 
      lsmeans Gender / pdiff; 
      slice Gender*Age / sliceby=Age; 
      slice Gender*Age / sliceby=Gender diff; 
      run;

http://support.sas.com/kb/22/905.html

[sld · Accepted solution]

You need to request adjustment using the ADJUST option. Note that the adjustments are for the set of comparisons within a slice, and not for the full set of comparisons reported in the "Simple Differences" table.