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2012 Apr 12
0
Multivariate multilevel mixed effects model: interaction
Hello. I am running a multivariate multilevel mixed effects model, and am trying to understand what the interaction term tells me. A very simplified version of the model looks like this: model <- lmer (phq ~ -1 + as.factor(index_phq) * Neuro + ( -1 + as.factor(index_phq)|UserID), data=data) The phq variable is a categorical depression score on 9 depression items (classified by the variable "index_phq"), and Neuroticism is a covariate (random effect = the subjects of my study, they should be allowed to vary in slope/...