[R-sig-ME] Imputation methods mixed model analysis

[Breugelmans, S. (Sara)]

Dear colleagues,


For my thesis I am conducting a mixed model analysis on longitudinal data. However, when I tried to run an intercept-only model I got the following error:


preCORT_ICC <- lmer(Data_F_long$Cortisol_pre ~ 1 + (1 | Data_F_long$ID), data = Data_F_long)
Error in KhatriRao(sm, t(mm)) : (p <- ncol(X)) == ncol(Y) is not TRUE

?

When I searched this error I saw that it might have to do something with the number of NA's. So then I thought it would be better to use some kind of imputation strategy.

I was wondering if there is a build-in function in lmer() to do this. Or is it better to manually impute the data before analysing.


I already found a function called mice(). Does anyone of you have experience with mice() and would you recommend using it?


Of course it would be more convenient if I could use some kind of build-in function in lmer().


Thank you for your response!


Kind regards


Sam

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