How could I select the rows of a dataset that have the maximum value in one variable and to do this nested in another variable. It is a dataframe in long format with repeated measures per subject. I was not successful using aggregate, because one of the columns has character values (and/or possibly because of another reason). I would like to transfer something like this: subject time.ms V3 1 1 stringA 1 12 stringB 1 22 stringC 2 1 stringB 2 14 stringC 2 25 stringA …. To something like this: subject time.ms V3 1 22 stringC 2 25 stringA …
Thank you very much for you help! Miriam -- Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a ______________________________________________ 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.
