[BioC] Fwd: Re: rcor.test

[Naomi Altman]

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>From: Damion Colin Nero <dcn208 at nyu.edu>
>To: Naomi Altman <naomi at stat.psu.edu>
>Date: Sat, 03 Feb 2007 18:46:28 -0500
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>Subject: Re: [BioC] rcor.test
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>I mean that I have K variables of length N in 1 group and K variables of
>length N in the second group and I am trying to make comparisons between
>them.  The vectors are the same length it is just that the list of
>vectors in each data matrix are different lengths.  I know that you can
>make this kind of comparison using cor by calling one matrix X and the
>other matrix Y but I wanted to know if there was a way to do this with
>the cor test function
>
>Damion Nero
>Plant Molecular Biology Lab
>Department of Biology
>New York University
>766 Waverly building
>New York, NY 10003-6688
>Tel: (212) 998-3964
>email: dcn208 at nyu.edu
>
>
>----- Original Message -----
>From: Naomi Altman <naomi at stat.psu.edu>
>Date: Saturday, February 3, 2007 12:34 pm
>Subject: Re: [BioC] rcor.test
>
> > I still don't understand what you are trying to do.  Do you mean
> > that
> > you have k variables of length n in 1 group, and m variables also
> > of
> > length k in another and you want to compute all the correlations
> > between variables in the 2 groups?
> >
> > --Naomi
> >
> > At 05:27 PM 2/2/2007, Damion Colin Nero wrote:
> > >What I am looking for is to pair one observation with all others as
> > >computing all possible pairwise correlations is computationally
> > >unfeasible using R with very large datasets
> > >
> > >Damion Nero
> > >Plant Molecular Biology Lab
> > >Department of Biology
> > >New York University
> > >
> > >
> > >----- Original Message -----
> > >From: Naomi Altman <naomi at stat.psu.edu>
> > >Date: Friday, February 2, 2007 3:31 pm
> > >Subject: Re: [BioC] rcor.test
> > >
> > > > To me, correlation measures the linear association between paired
> > > > observations.  Since the pairing is essential, how could the
> > > > datasets
> > > > not be the same length?
> > > >
> > > > --Naomi
> > > >
> > > > At 10:12 AM 1/31/2007, Damion Colin Nero wrote:
> > > > >I am using the rcor.test function available in the ltm package
> > and> > >wanted to know if there was a way to use this function to
> > compute the
> > > > >correlation of two datasets that are not of equal length (similar
> > > > to the
> > > > >base cor function).  I was thinking an apply function like by
> > > > might work
> > > > >but so far I have had no luck getting it to work.I was
> > wondering if
> > > > >anyone could give me some general advice on this.
> > > > >
> > > > >Damion Nero
> > > > >Plant Molecular Biology Lab
> > > > >Department of Biology
> > > > >New York University
> > > > >
> > > > >_______________________________________________
> > > > >Bioconductor mailing list
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> > > > >Search the archives:
> > > > >http://news.gmane.org/gmane.science.biology.informatics.conductor
> > > >
> > > > Naomi S. Altman                                814-865-3791
> > (voice)> > Associate Professor
> > > > Dept. of Statistics                              814-863-7114
> > (fax)> > Penn State University                         814-865-1348
> > > > (Statistics)University Park, PA 16802-2111
> > > >
> > > >
> >
> > Naomi S. Altman                                814-865-3791 (voice)
> > Associate Professor
> > Dept. of Statistics                              814-863-7114 (fax)
> > Penn State University                         814-865-1348
> > (Statistics)University Park, PA 16802-2111
> >
> >

Naomi S. Altman                                814-865-3791 (voice)
Associate Professor
Dept. of Statistics                              814-863-7114 (fax)
Penn State University                         814-865-1348 (Statistics)
University Park, PA 16802-2111