ngrps {lme4} | R Documentation |
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, ...)
object |
an |
... |
currently ignored. |
Currently there are methods for objects of class
merMod
, i.e., the result of lmer()
etc,
and factor
objects.
The number of levels (of a factor) or vector of number of levels for each “grouping factor” of a
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"