Hi or you can just call factor function after subsetting
newdata[,7] <- factor (newdata[,7]) Regards Petr > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Ista Zahn > Sent: Wednesday, January 16, 2013 6:36 PM > To: paladini > Cc: r-help@r-project.org > Subject: Re: [R] How to change levels? > > Hi, > > see ?droplevels and/or the "stringsAsFactors" section of ?options > > Best, > Ista > > On Wed, Jan 16, 2013 at 4:56 AM, paladini <paladini@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. ______________________________________________ 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.
