Simple mediation of fixed effects for random intercept models

Question

Is it possible to use the path analysis tool for mediation models with repeated measures? I am looking to power a simple mediation model, but one where the two regressions have random intercepts. In other words, there is an independent variable X, a mediator M that every participant responds to n times, and a dependent variable Y that every participant responds to n times. I know I can simply use OLS if I average over the n responses, but I was hoping to avoid that. Thank you in advance for your help.

Answer 1

If you can specify your model as a wide format SEM model, it can be done using WebPower. Otherwise, the current multilevel method in WebPower only support univariate mixed-effects models.