Re: [R] correlation by subset

From: Chuck Cleland <ccleland_at_optonline.net>
Date: Wed 24 Aug 2005 - 22:05:40 EST

by(mydata, mydata$GROUPING, function(x) cor(x$x, x$y, use="pair"))

?by

Krishna wrote:
> Hi all
>
> Having searched the available documentation on R, I request for help
> in sorting out the underlying problem.
>
> I have a huge dataset containing 2 variables x and y, which is a daily
> price series.
>
> I would like to observe the quarterly correlations among these two
> variables. Is there anyway where i can calculate cor.coeff by using a
> grouping variable in R.
>
> thanks in advance for the help
>
> rgds
>
> snvk
>
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Received on Wed Aug 24 22:10:52 2005

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