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What is more advanced about SPSS mixed models (not accusatory, just ignorant)? It looks like there are more covariance options, but is the estimation/implementa
by bobbert_barker 10y ago
What is more advanced about SPSS mixed models (not accusatory, just ignorant)? It looks like there are more covariance options, but is the estimation/implementation better/more robust or faster?
- SubiculumCode 10y agoWell I may be ignorant also, but as far as I can tell lme4/lmer doesnt have ANY options to specify the variance-covariance matrix while SPSS does. Also, when the number of within subject levels are few, I often find that using the classic repeated measures approach, but estimating using ML/REML (to handle random missing data) on a specified (or unstructured) covariance-variance matrix to be more powerful and/or more likely to converge while accounting for important dependences than mixed models using random effects...SPSS does this kind of analysis easily, but I havent found any equivalent packave in R.
- SubiculumCode 10y agoHM