[R] drop observations
dwinsemius at comcast.net
Fri Dec 31 00:04:18 CET 2010
On Dec 30, 2010, at 5:53 PM, David Winsemius wrote:
> On Dec 30, 2010, at 4:54 PM, Charlène Cosandier wrote:
>> 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 "&".
> 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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