treat NA's as zero when summed up with numbers

Wed, Oct 12, 2011 1:45 PM

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Samir Benzerfa treat NA's as zero when summed up with numbers Oct 12 David Winsemius treat NA's as zero when summed up with numbers Oct 12 David Winsemius treat NA's as zero when summed up with numbers Oct 12 Bert Gunter treat NA's as zero when summed up with numbers Oct 12