We really should have some sample data (see dput() for a handy way to post some).
However have a look at ?reshape, the plyr and reshape packages or perhaps the data.table package. John Kane Kingston ON Canada > -----Original Message----- > From: libgray3...@gmail.com > Sent: Tue, 5 Jun 2012 21:07:50 -0700 (PDT) > To: r-help@r-project.org > Subject: [R] Combine subsets by factor level > > I'm attempting to change a data set by compressing rows into columns. > Currently there are several rows that all have information about one > "patient," but at different cycles. I'm trying to make each patient only > have one row in the data set. > > Does anyone know a good way to combine data sets by factor level? I've > separated the groups into different subsets by cycle, but not every > patient > has data for every cycle (i.e. there are 1200 who have cycle 0, but only > 200 > of those have a cycle 1, and a different number have cycles higher than > that, etc). I then made the patient number the identifying label. If > there > is a way to column-combine these subsets by the factor level of these > patient names, and leave any patients that are missing a cycle as NA? > > If anyone has insight on how to do this, or a better way to complete what > I'm trying to do, I'd appreciate it! > > -- > View this message in context: > http://r.789695.n4.nabble.com/Combine-subsets-by-factor-level-tp4632472.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. ____________________________________________________________ FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! ______________________________________________ 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.
