Hi, does this help?
http://www.nabble.com/factor-question-to18638814.html#a18638814 HTH, Stephan Ine schrieb:
Hi all, I have got a seemingly simple problem (I am an R starter) with subsetting my data set, but cannot figure out the solution: I want to subset a data set from six to two levels, so that all analyses are done only with these two remaining levels. I tried TOTAL<-read.delim('total.csv',header=T) SUBSET.OF.TOTAL<-subset(TOTAL, FactorX %in% c("Level1","Level2")) attach(SUBSET.OF.TOTAL) but R does not eliminate the remaining levels of FactorX, just assigns 'not available' to the data. Like this, the other levels still show up in plots etc., but without data entries. Anybody got a solution how to subset the data so that I eliminate the other levels completely? Thanks a lot for the help,
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