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
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