On 13.09.2010 17:43, Luana Marotta wrote:
Hello all, I want to specify a minimum number of valid arguments for the mean function--I have 5 variables but I want the mean only of cases that have at least 3 valid answers. What is the best way to do that?
If your 5 variables are in a data.frame dat: sapply(dat, function(x) if(sum(!is.na(x)) > 2) mean(x) else NA) Uwe Ligges
Thank you very much! Luana [[alternative HTML version deleted]] ______________________________________________ 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.
______________________________________________ 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.