On Oct 12, 2011, at 12:45 PM, Samir Benzerfa wrote:
Hello everybody,
is there any way to treat NA's as zero when they are summed up with
numbers,
but to treat them as NA's when summed up only with NA's.
Specifically want
that: 5+NA=5, but NA+NA=NA (and not zero).
sum(x , na.rm=TRUE)
--
David Winsemius, MD
West Hartford, CT
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