analysis question

Posted by Zdaniuk, Bozena-3 on Mar 30, 2020; 7:13am
URL: http://spssx-discussion.165.s1.nabble.com/heatmap-of-correlation-matrix-w-o-varstocases-tp5738932p5738936.html

hello everyone,

I am trying to figure out how to best analyze my data. I have pre-treatment, post-treatment, and two follow-up time points for two treatment groups. When I analyze just pre and post treatment points (using MIXED procedure) I find an interaction of group x time indicating that Treatment A improves more than Treatment B. But if I analyze all four points, both treatments maintain their gains but no more changes after post-treatment for either group and the interaction of group x time (all four time points) disappears.

Would it make sense to still want to report on the interaction from pre- to post-treatment? if yes, what is the best way to do it? Or I should just ignore that interaction if it does not show when all four times are in the analysis?

Any thoughts greatly appreciated!

cheers,

bozena

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