[R] Setting NA

Anupam Tyagi AnupTyagi at yahoo.com
Sat Sep 30 18:47:38 CEST 2006

Is there a way to set NA values in R, without changing the dataframe? I would
like to use different combinations of non-response values, as if they were NA
for some of the computations. I don't want to change the dataframe each time I
have to do this?

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