Posted by
Zdaniuk, Bozena-3 on
Jun 13, 2017; 5:58pm
URL: http://spssx-discussion.165.s1.nabble.com/Moderation-in-multi-level-mixed-analysis-tp5734423.html
hello, I am analyzing a longitudinal intervention study with two different intervention groups. Participants are measured on DV pre-, post- and at 6 month followup. I would like to test the following moderation model question:
Does baseline measured (level 2) variable ModVar moderate changes in dependent variable DV from baseline to post-test to follow-up (3 time points), across both intervention groups? I am running the syntax below. Is my thinking correct that finding a significant interaction of the ModVar X Time would indicate the moderation effect?
Any pointers towards literature, websites, etc., will also be greatly appreciated.
thanks so much,
bozena
MIXED
DV BY group Time WITH ModVar
/FIXED = group Time group*Time ModVar ModVar*Time | SSTYPE(3)
/Random = intercept | SUBJECT(id) COVTYPE(ID)
/REPEATED Time | SUBJECT(id) COVTYPE(DIAG)
/METHOD = ML
/PRINT = DESCRIPTIVES SOLUTION TESTCOV R
/EMMEANS=TABLES(group) COMPARE ADJ(BONFERRONI)
/EMMEANS=TABLES(Time) COMPARE ADJ(BONFERRONI)
/EMMEANS=TABLES(group*Time) COMPARE (group) ADJ(BONFERRONI)
/EMMEANS=TABLES(group*Time) COMPARE (Time) ADJ(BONFERRONI).
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