Factor Levels Assignment

Description

levels<- provides a way to alter the levels attribute of factor. value can be a vector of character strings with length equal to the number of levels of x, or a named list specifying how to rename the levels.

Usage

levels(x) <- value

See Also

factor, levels, levels<-, nlevels.

Examples

# assign individual levels
x <- gl(2, 4, 8)
levels(x)[1] <- "low"
levels(x)[2] <- "high"

# or as a group
y <- gl(2, 4, 8)
levels(y) <- c("low", "high")

# combine some levels
z <- gl(3, 2, 12)
levels(z) <- c("A", "B", "A")

# same, using a named list
z <- gl(3, 2, 12)
levels(z) <- list(A=c(1,3), B=2)