Prune Factor Levels

Usage

pruneLevels(object)

Arguments

object an object inheriting from class factor.

Description

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

Value

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

Author(s)

Jose Pinheiro and Douglas Bates

See Also

factor, link{ordered}

Examples

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

[Package Contents]