On Dec 30, 2010, at 5:53 PM, David Winsemius wrote:
On Dec 30, 2010, at 4:54 PM, Charlène Cosandier wrote:
Hi,
I want to drop observations with value 0 from my data.frame "dta"
for each
of the two variables "c01" and "ctotale". How can I do that?
And on second look I wonder if my translation from English to Boolean
was correct. If you wanted to excluded any case with c01 == 0 or
ctotal==0 then the code was correct, but if you wanted to exclude only
case where both were zero, the code would be incorrect and the logical
operator should be changed to "&".
Thanks
subset(dta, !( c01==0 | ctotale==0) )
... remembering of course to assign this result to some
appropriately named object.
Charlène Lisa Cosandier
David Winsemius, MD
West Hartford, CT
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