The last line of the example in droplevels' manual page seems to be incorrect to me. I think it should read: "table(droplevels(aq$Month))". Amazingly (I don't understand) both variants seem to produce the same result (R 3.3.3): --- > aq <- transform(airquality, Month = factor(Month, labels = month.abb[5:9])) > aq <- subset(aq, Month != "Jul") > table(aq$Month)
May Jun Jul Aug Sep 31 30 0 31 30 > table(droplevels(aq)$Month) May Jun Aug Sep 31 30 31 30 > table(droplevels(aq$Month)) May Jun Aug Sep 31 30 31 30 > --- For the sake of learners, try to keep the examples simple and useful, even though you experts want to impress the newbees... Ulrich ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
