Hi there- I would like to find out whether there is an interaction between treatment group and time, using a special contrast of treatment group. In my example, treatment group has 3 levels, and time has 5 levels. I am able to get the output for the custom hypotheses, but the interaction effects seem to be based on the default coding for treatment group.

Here is my syntax:

MIXED WEEKLYCIGS by GROUP with WEEK /FIXED = GROUP WEEK GROUP*WEEK | SSTYPE (3) /test 'G1 v G3' group -1/2 0 1/2 /test 'G2 v G1 and G3 ' GROUP -1/2 1 -1/2 /PRINT SOLUTION LMATRIX/METHOD = REML /RANDOM INTERCEPT |SUBJECT (ID).

Any advice?

Charla

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