I have a data frame that shows all of the parks (including duplicates) that are impacted by a projects 'footprint':
PROJECT PARKNAME A PRK A A PRK B A PRK A B PRK C B PRK A C PRK B C PRK D ... What I need is a cross tabulation that shows me the number of unique parks for each project. If I using the standard table(df$PROJECT) it reports: A 3 B 2 C 2 ... where I need it to ignore duplicates and report: A 2 B 2 C 2 ... Anyone have any suggestions on how to do this within the R paradigm? Walter Anderson ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
