Hello, I am trying to evaluate the group differences of the change from baseline in an EEG index (fMMN_amplitude), using the Linear Mixed Models process. I entered Cluster (three groups), time (two visits), Cluster × time interaction as fixed effects, baseline MMN_amplitude value as a covariate, and participant as a random effect for the intercept. I used EMMEANS to obtain the change from baseline of MMN_amplitude in each Cluster. Below are the command lines I used.

However, I could not find a way to compare the change values between groups. Can someone please let me know if there is a way to acquire such group differences and the effect sizes, just like the mean difference versus placebo in the following picture (from DOI: 10.1016/S2215-0366(20)30513-7).

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GuiSen Wu
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