[R] na.rm problem

Ulrich Keller uhkeller at web.de
Tue Aug 1 13:38:38 CEST 2006

```Like the error message tells you, cor does not have an argument "na.rm".
use="complete" already does what you want, namely casewise deletion of
missing values.

However, this will not work with vectors of unequal length (how is R to
determine which observations in x correspond to those in y?). What you
could do is create a copy of y that has the same length as x but is
"padded" with NAs (missing values) using something like:

y.NA<-c(rep(NA, length(x) - length(y)), y)

Then you can compute the correlation:

cor(x, y.NA, use="complete")

sonal at deepfoo.com wrote:
> hi,
>
> i am a new member.
>
> i am using R in finding correlation between two variables of unequal length.
>
> when i use
>
> cor(x,y,na.rm=T,use="complete")
>
> where x has observations from 1928 to 2006 & y has observations from 1950 to
> 2006. I used na.rm=T to use the "complete observations".  So missing values
> should be handled by casewise deletion. But it gives me error
>
> Error in cov(close, close1, na.rm = T, use = "complete") :
>         unused argument(s) (na.rm ...)
>
>
>
> Thanks,
> Sonal
>
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