[R] Counting NA?

[Petr Pikal]

On 23 Oct 2002 at 10:52, Matej Cepl wrote:

> On Wed, Oct 23, 2002 at 01:54:50PM +0200, David Wartel wrote:
> > Surely not the best method:
> > length(which(is.na(data$S2)==TRUE))
> 
> Hi,
> 
> I am sorry, of course, that I have found similar solution
> ("==TRUE" is unnecessary) five seconds after firing up
> 'sendmail -q'.  Thanks for the references to z-score,
> t-distribution, etc., though.
> 
> One this I was really surprised what that in order to get data
> from the same data I have to use following construct constantly:
> 
>  sumyes <- length(data$S2[data$S2 == 1 & !is.na(data$S2)])
> 
> Isn't there any way how to say R, that I want eliminate NA data 
> for all my following calculations?

?na.rm
?na.omit
?na.exclude

depending what you want to do with the result.



> 
> Matej
> 
> -- 
> Matej Cepl, matej at ceplovi.cz, PGP ID# D96484AC
> 138 Highland Ave. #10, Somerville, Ma 02143, (617) 623-1488
> 
> The politician attempts to remedy the evil by increasing the very
> thing that caused the evil in the first place: legal plunder.
>     -- Frederick Bastiat
> 
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Petr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz


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