Try looking at subset()... I typically use this when I'm trying to isolate specific cases from a data frame.
Also, Dalgaard's introductory R book has some great examples for parsing data in the manner you're attempting.... you might want to look at that. Mike On Thu, Dec 2, 2010 at 2:08 PM, Diogenas <dioge...@gmail.com> wrote: > > Hello, > I understand that question is probably stupid, but ... > > I have data (polity IV index) > "country","year","democ","autoc","polity","polity2" > "1","Afghanistan ",1800,1,7,-6,-6 > "2","Afghanistan ",1801,1,7,-6,-6 > "3","Afghanistan ",1802,1,7,-6,-6 > > I need to create new data sets which includes only cases after year 1995. > I've tried this command: > poli2<-poli[poli$year > 1994,] , > however it generated this: > Error in poli[poli$year > 1994, ] : incorrect number of dimensions. > Any ideas how i can overcome this? > > Thank in advance for your help, > > > > > > ----- > Diogenas > -- > View this message in context: > http://r.789695.n4.nabble.com/Filter-data-tp3070069p3070069.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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Michael Rennie, Research Scientist Fisheries and Oceans Canada, Freshwater Institute Winnipeg, Manitoba, CANADA [[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.
