[R] how to ignore "NA" or replace it by another value

Doran, Harold HDoran at air.org
Thu Sep 21 20:53:21 CEST 2006

It depends a bit on what function you are using. For example,

xx <- c(NA, rnorm(10))
> mean(xx)
[1] NA
> mean(xx, na.rm=TRUE)
[1] 0.1322028

Is how you would use this to compute a mean.


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Thomas Preuth
> Sent: Thursday, September 21, 2006 1:59 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] how to ignore "NA" or replace it by another value
> Hello,
> I`m a newbie to R so maybe this question is boring, but I 
> have a large table with several empty missing values, which 
> come out as "NA". How can i ignore them or replace them by 
> another number?
> Greetings, Thomas
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