[R] Counting NA?
Ben Bolker
ben at zoo.ufl.edu
Wed Oct 23 14:12:31 CEST 2002
sum(is.na(data$S2))
[is.na returns TRUE/FALSE, which can also be added up as 0/1 values]
For your other question: see ?pt, ?pnorm (which will also give you
information about qt, qnorm, the quantile functions)
Or help.search("normal"), help.search("Student")
On Wed, 23 Oct 2002, Matej Cepl wrote:
> Hi,
>
> how to do quickly equivalent of the following?
>
> counter = 0
> for(i in 1:length(data$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
>
>
--
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Zoology Department, University of Florida http://www.zoo.ufl.edu/bolker
Box 118525 (ph) 352-392-5697
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