Something like: newVar <- ifelse(group == 1 & diagnosis == 1, 'positive', 'negative')
[You might want to coerce that to a factor if you wish.] Andy > From: Shaw, Philip (NIH/NIMH) > > Hi > > A very simple question (from a R novice) > > How do I create a new variable within R. I have two existing > variables (eg > group number 1,2,3 and diagnosis 1,2,3). How would I create > a new variable > in which those in group1 with diagnosis 1 are assigned > 'positive' and the > remainder are 'negative'?? > > Many thanks- and sorry it's so simple! > > Philip > > [[alternative HTML version deleted]] > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
