Try data2$X<-factor(data2$X)
By the way, avoid call data as "data", matrix as "matrix", vector as "vector". cheers milton On Wed, Mar 10, 2010 at 4:35 PM, clee <cheel...@gmail.com> wrote: > > If anyone can help with this, I would greatly appreciate it. > > When I subset a dataframe, and then create a table of on of the column > variables, the levels of that variable are retained from the parent > dataframe. Anyone know how to > > > for example, say I have data like so: > > data: > X Y > a 2 > b 2 > a 3 > b 3 > a 5 > > if I do.... > > data2=subset(data,X=="a") > > I get the new data frame: > > data2: > X Y > a 2 > a 3 > a 5 > > but if I do this... > > table(data2$X) > > I would get this: > > X Y > 3 0 > > additionally when I write... > > levels(data2$X) > > I get... > Factors w/ 2 levels: "a", "b" > > I want it to be... > Factors w/ 1 level: "a" > > Normally I would just move on and won't even bother but I'm working with a > variable that has 204 levels and only 84 of those are meaningful to me. > How > can I reset the levels of a column variable? help please! Thanks! > -- > View this message in context: > http://n4.nabble.com/modify-the-levels-of-a-variable-tp1588089p1588089.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
