specifying multiple random effects in R lmer (translating from HLM model) -


i'm attempting "translate" model run in hlm7 software r lmer syntax.

this now-ubiquitous "math achievement" dataset. outcome math achievement score, , in dataset there various student-level predictors (such minority status, ses, , whether or not student female) , various school level predictors (such catholic vs. public).

the predictors in model want fit student-level predictors, have been group-mean centered deal dummy variables (aside: contrast codes better). students nested in schools, should (i think) have random effects specified of components of model.

here hlm model:

level-1 model (note: predictors @ level 1 group mean centered) mathachij = β0j + β1j*(minorityij) + β2j*(femaleij) + β3j*(sesij) + rij

level-2 models

β0j = γ00 + u0j

β1j = γ10 + u1j

β2j = γ20 + u2j

β3j = γ30 + u3j

mixed model

mathachij = γ00 + γ10*minorityij + γ20*femaleij + γ30*sesij + u0j + u1j*minorityij + u2j*femaleij + u3j*sesij + rij

translating lmer syntax, try: (note: _gmc means variable has been group mean centered, grouping factor "school_id")

model1<-lmer(mathach~minority_gmc+female_gmc+ses_gmc+(minority_gmc|school_id)+(female_gmc|school_id)+(ses_gmc|school_id), data=data, reml=f)

when run model results don't mesh hlm results. specifying random effects incorrectly?

thanks!


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