search for: karean

...y question is: how can I merge the two files and keep only the rows whose "id" show up in the first file? I know how to do it is SAS, just use the following code: merge data1(in=in1) data2(in=in2); by id; if in1; but I really have no idea about how to do it in R. thank you in advance, karean -- View this message in context: http://n4.nabble.com/merging-issue-tp1013356p1013356.html Sent from the R help mailing list archive at Nabble.com.