R help - Sep 2006 - Setting NA

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?
Anupam.

Would using the subset argument that is available in many functions
(eg lm) achieve what you want?

On 30/09/06, Anupam Tyagi <AnupTyagi at yahoo.com>
wrote:
> 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?
> Anupam.
>
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-- 
================================David Barron
Said Business School
University of Oxford
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