[R] Counting NA?

[Matej Cepl]

Hi,

how to do quickly equivalent of the following?

	counter = 0
	for(i in 1:length(data$S2)) {
		if(!is.na(data$S2[i])) {
			counter = counter + 1
		}
	}

I have imagined something like length(x,na.rm=TRUE).

How can I get values usually taken from tables like z-score, 
values of t distribution etc.? I could not find them among 
values mentioned in info file.

Thanks,

Matej

-- 
Matej Cepl, matej at ceplovi.cz, PGP ID# D96484AC
138 Highland Ave. #10, Somerville, Ma 02143, (617) 623-1488
 
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every time Congress meets
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