getGrpVar function

Get Grouping Variable

Extract grouping variables for random effect terms from a factor list

getGrpVar(x)

Arguments

• x: "flist" object; a data frame of factors including an assign attribute matching columns to random effect terms

Returns

character vector of grouping variables

Examples

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)