relevel {stats}
Reorder Levels of Factor
Description
The levels of a factor are re-ordered so that the level specified by ref is first and the others are moved down. This is useful for contr.treatment contrasts which take the first level as the reference.
Usage
relevel(x, ref, ...)
Arguments
- x
- An unordered factor.
- ref
- The reference level.
- ...
- Additional arguments for future methods.
Values
A factor of the same length as x.
See Also
Examples
warpbreaks$tension <- relevel(warpbreaks$tension, ref = "M") summary(lm(breaks ~ wool + tension, data = warpbreaks))
Documentation reproduced from R 3.0.1. License: GPL-2.