I have a data frame with 2 columns, the first is an index of participants and the second is a list of words presented to the participant (see below).
> head(dat) s word 1a pianist 1a sweat 1a carnage 1a nymph 1a hank 1a waist > tail(dat) s word 4a package 4a blink 4a orange 4a bedroom 4a curb 4a bowl Some of the words are presented to multiple participants others are not. I am trying to get an index of 1) which words are repeated and 2) how many times they are repeated. Any suggestions? Lee ______________________________________________ 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.