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Extract grouping variables for random effect terms from a factor list
getGrpVar(x)
character vector of grouping variables
"flist" object; a data frame of factors including an assign
attribute
matching columns to random effect terms
data(cbpp,package="lme4")
cbpp$obs <- factor(seq(nrow(cbpp)))
rt <- lme4::glFormula(cbind(size,incidence-size)~(1|herd)+(1|obs),
data=cbpp,family=binomial)$reTrms
getGrpVar(rt$flist)
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