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Returns the number of levels of a factor or a set of
factors, currently e.g., for each of the grouping factors of
lmer(), glmer(), etc.
ngrps(object, …)an R object, see Details.
currently ignored.
The number of levels (of a factor) or vector of number of levels for each “grouping factor” of a
Currently there are methods for objects of class
'>merMod, i.e., the result of lmer() etc,
and factor objects.
# NOT RUN {
ngrps(factor(seq(1,10,2)))
ngrps(lmer(Reaction ~ 1|Subject, sleepstudy))
## A named vector if there's more than one grouping factor :
ngrps(lmer(strength ~ (1|batch/cask), Pastes))
## cask:batch batch
## 30 10
methods(ngrps) # -> "factor" and "merMod"
# }
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