I am examining the interaction effect of Sex (male, female; between-subject factor) and Time (11 levels; within-subject factor). I would like to adjust for a time-invariant covariate.
In the 'model' tab, which model effects should I add? For example, Sex, Time, Sex*Time, Covariate, Time*Covariate?
Hello Abolfazl Ghoodjani
If I want to adjust for the time-invariant covariate and want to look at the Sex*Time interaction, should I be adding Sex, Time, Sex*Time, Covariate, Time*Covariate in the model effects?
Thank you for your answer Abolfazl Ghoodjani!
Just to double check, I don't need to add in the Sex*Time*Covariate interaction in the model? I apologize for my lack of knowledge.
I think it is better to add all possible interactions to your model
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