I am calculating in R an ANOVA with repeated measures in 2x2 mixed design. For this I use one of the following inputs in R:
(1) res.aov <- anova_test(data = datac, dv = Stress, wid = REF,between = Gruppe, within = time ) get_anova_table(res.aov)
(2) aov <- datac %>% anova_test(dv = Stress, wid = REF, between = Gruppe, within = time, type = 3) aov
Both lead to the same results. Now I want to add a covariate from the 1st measurement time point. So far I could not find a suitable R input for the ANCOVA for this repeated measures design.
Does anyone of you perhaps have an idea?
Many greetings
ANOVA <- aov(Stress~time+covariate, data = data) summary(ANOVA)
For a simple ANCOVA, the R input of an ANOVA with the addition of the covariate applies. Unfortunately, I have no idea how this works in the repeated measures design.
