Dear all,
I am running a repeated measures ANOVA model with 4 longitudinal measurements for each of the 2 groups. The baseline measurements were found to be quite different. So I include the first measurement as a covariate in order to make adjustment for that while the other 3 measurements as dependent variables.
However, using SPSS I can no longer construct a contrast involving the baseline values because it is now a covariate. How can I get around this problem?
Thanks in advance,
Peggo Lam
Department of Rehabilitation Sciences
Hong Kong Polytechnic University
Hong Kong
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