[R] Factor level with no cases shows up in a plot

Stefan Grosse singularitaet at gmx.net
Wed May 27 22:19:46 CEST 2009

Arthur Burke wrote:
> ...  I get the four lines that I expected but the legend includes the
> Group level "cohort 4" .
> How can I get rid of "cohort 4" in Group?

This link might be of interest for you:


More information about the R-help mailing list