RM ANOVA with Covariates vs ANCOVA
I don't understand the difference between two different types of analyses in JASP.
I need to run a Repeated Measure ANCOVA, but I looks like Jasp does not have this option. I then ran a "normal" ANCOVA and calculated the Marginal Means that I'm interested in. I then ran with the same data a RM ANOVA inserting my covariate variable in the Covariates section of the RM ANOVA. The estimated means that I get in this case are completely different (and implausible considering the data) from those I get from the "normal" ANCOVA.
I was wondering if someone could explain to be the difference in the two analyses and which one is the most appropriate in this case.
Thank you all