pruneLevels {nlme} | R Documentation |
The levels
attribute of object
are pruned to contain
only the levels occurring in the factor.
pruneLevels(object)
object |
an object inheriting from class factor . |
an object identical to object
, but with the levels
attribute containing only value occurring in the factor.
Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu
f1 <- factor(c(1,1,2,3,3,4,5)) levels(f1) f2 <- f1[4:7] levels(f2) levels(pruneLevels(f2))