Dear members of this list,
I'd like to count missing values using the aggregate function.
Something like this:
count_nas <- function(arg1) {
return(sum(is.na(arg1)))
}
aggregate(cbind(var1, var2, var3) ~ subject + time, data = mydataset,
count_nas)
It's not working: I end up with a matrix containing zeros, although
there are missings in the data frame.
I'd highly appreciate a hint!
Thanks a lot,
Timo Stolz
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