pruneLevels {nlme}R Documentation

Prune Factor Levels

Description

The levels attribute of object are pruned to contain only the levels occurring in the factor.

Usage

pruneLevels(object)

Arguments

object an object inheriting from class factor.

Value

an object identical to object, but with the levels attribute containing only value occurring in the factor.

Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

See Also

factor, ordered

Examples

f1 <- factor(c(1,1,2,3,3,4,5))
levels(f1)
f2 <- f1[4:7]
levels(f2)
levels(pruneLevels(f2))

[Package Contents]