Factor level with no cases shows up in a plot
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: http://wiki.r-project.org/rwiki/doku.php?id=tips:data-manip:drop_unused_levels hth Stefan