[R] Subset: data frames and factor levels

[Stefan Grosse]

On Tuesday 01 April 2008 09:43:00 am Agustin Lobo wrote:
AL> I'm doing:
AL> etni <- subset(etni, NAMECOM!="Maniquisito")
AL>
AL> where etni is a data.frame, NAMECOM a factor and "Maniquisito" labels
AL> a row that I want to delete.
AL>
AL> The problem is that while the row is deleted, the factor level is still
AL> there (I can see "Maniquisito" if I do levels(etni$NAMECOM) ).

See
http://wiki.r-project.org/rwiki/doku.php?id=tips:data-manip:drop_unused_levels

Stefan



-- 
Microeconomics
University of Erfurt