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Post hoc for nested designs?
How do you do pairwise comparisons on nested designs? Does anyone know of a syntax for either SPSS or SAS?
Hope you can help me. I'm really at a loss.
2 Answers
- Math ChickLv 41 decade agoFavorite Answer
Normally nested designs are run to estimate variance components, so you must have a somewhat unique application. Here is an example to do all pairwise comparisons in SAS. You have to take care in interpreting the results.
Suppose you have two factors, A and B with B nested within A and you want to perform the Tukey-Kramer Multiple Comparison Procedure. Using PROC GLM, the partial code would be
PROC GLM;
CLASS A B;
MODEL Y = A B(A);
LSMEANS A B(A)/STDERR PDIFF ADJUST=TUKEY;
RUN;
Math (and Stats) Rule!
- 1 decade ago
I hate to say this, but I heard a colleague complain the other day that SPSS cannot do this. I don't know about SAS. There is a listserv here for SPSS that maybe you can join and get some answers? http://listserv.uga.edu/archives/spssx-l.html