[R] correlation by subset

[Krishna]

Hi Mr. Cleland

it worked excellently well, and i believe the same logic or function
by() can be used even for running regressions on subsets of huge
datasets. correct me if iam wrong

thank you for the help

rgds

snvk

On 8/24/05, Krishna <snvk4u at gmail.com> wrote:
> Hi Mr. Cleland
> 
> Could you please detail the function.
> 
> Thanks and best regards
> 
> snvk
> 
> On 8/24/05, Chuck Cleland <ccleland at optonline.net> wrote:
> > 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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> >
> > --
> > Chuck Cleland, Ph.D.
> > NDRI, Inc.
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> >
>