I don't quite understand what you are looking for. I originally thought that a simple subset would do it but I don't understand the selection criteria are for the output data file.s
Original idea: want <- subset(dat1, dat1$var =="y") John Kane Kingston ON Canada > -----Original Message----- > From: valkr...@gmail.com > Sent: Tue, 11 Feb 2014 08:26:39 -0500 > To: r-help@r-project.org > Subject: [R] (no subject) > > Hi all, > I have a sample of data set with variables day, ID,var and month: > day ID var Month > 1 11 x March > 1 11 x March > 1 11 x April > 1 11 y March > 1 11 x March > 1 11 y March > 2 11 x March > 2 11 y March > 3 11 x March > 3 11 y March > 4 11 y March > > In the above data set there are four unique days within ID. For example > ID "11" has four records on day 1 and if this ID has "y" in "March" then > I > want keep "y" and discard "xs". Is it possible to keep them in two data > sets ( wanted and unwanted) > The output for wanted data set will be: > > 1 11 y March > 1 11 x April > 1 11 y March > 2 11 y March > 3 11 y March > 4 11 y March > thanks in advance > > [[alternative HTML version deleted]] > > ______________________________________________ > 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 MARINE AQUARIUM SCREENSAVER - Watch dolphins, sharks & orcas 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.