Hi, I hope somebody could help me explain what seems mysterious to me?
I use this line on a dataframe ae: summaryBy(total_inflated+total~gr1, data=ae, FUN=sum, na.rm=T) and it returns 3 columns as expected and columns "gr1" and "total_inflated.sum"are correct but the "total.sum" column consists of only zeros which is not correct. The same happens when I rename the "total_inflated" to "total.inflated" or "totalinflated" but not when I rename it to "ttotal_inflated". In the latter case I get the correct result also for the "total.sum" column. Could anyone explain the rules for the column naming to me? Thank you very much in advance! Werner Machen Sie Yahoo! zu Ihrer Startseite. Los geht's: ______________________________________________ R-help@stat.math.ethz.ch 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.