> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Diogenas > Sent: Thursday, December 02, 2010 12:09 PM > To: r-help@r-project.org > Subject: [R] Filter data > > > 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? >
We need more information. You haven't given us a self-contained, reproducible example. The syntax you show works for me. What does >str(poli) show? Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 ______________________________________________ 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.
