Number of Levels of a Factor or a "merMod" Model

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Description

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.

Usage

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ngrps(object, ...)

Arguments

object

an R object, see Details.

...

currently ignored.

Details

Currently there are methods for objects of class merMod, i.e., the result of lmer() etc, and factor objects.

Value

The number of levels (of a factor) or vector of number of levels for each “grouping factor” of a

Examples

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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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