Bingo! That's exactly the idiom I was looking for. Thanks, Andrija. -Michael
On 4/11/2014 4:57 PM, Andrija Djurovic wrote:
another: ave(as.numeric(Donner$family), Donner$family, FUN=length)
-- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. & Chair, Quantitative Methods York University Voice: 416 736-2100 x66249 Fax: 416 736-5814 4700 Keele Street Web: http://www.datavis.ca Toronto, ONT M3J 1P3 CANADA ______________________________________________ [email protected] 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.

