Hi, see ?droplevels and/or the "stringsAsFactors" section of ?options
Best, Ista On Wed, Jan 16, 2013 at 4:56 AM, paladini <palad...@beuth-hochschule.de> wrote: > Hello! > I have got a dataframe with 10 columns and 100 rows. The seventh column > consists of a lot of country names. > When I use newdata=subset(data, data[, 7]=="United Kingdom"|data[, > 7]=="Germany") I get just the rows where the country name is UK or Germany. > But the level information doesn`t change. That means if I use > levels(newdata[,7]), I get: > > [1] "Austria" "Belgium" > [3] "Denmark" "Finland" > [5] "France" "Germany" > [7] "Spain" "Sweden" > [9] "Switzerland" "The Netherlands" > [11] "United Kingdom" "United States of America" > That leads to problems in the further data processing . > > How can I change the level information to the real levels of newdata? > > Thanking you in anticipation > > Claudia > > ______________________________________________ > 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. ______________________________________________ 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.