Re: [R] candisc() error message

From: John Fox <jfox_at_mcmaster.ca>
Date: Sun, 15 Jun 2008 23:06:54 -0400

Dear Tanya,

If I follow correctly what you're trying to do, you're in effect doing a one-way MANOVA of 17 response variables on a six-level factor, with only 20 observations. That's not enough data. I'm copying to Michael Friendly in case he hasn't seen your posting and would like to comment.

Regards,
 John



John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox

> -----Original Message-----
> From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org]
On
> Behalf Of Tanya Yatsunenko
> Sent: June-15-08 8:23 PM
> To: r-help_at_r-project.org
> Subject: [R] candisc() error message
>
> Hi,
> I am doing canonical discriminant analysis using candisc function from
> the candisc package.
> My input is a table of species distribution (columns = abundance of each
> species in each sample) in samples that are split by categories (rows),
> and I want to know whether each category is associated with a particular
> set of species and their abundances.
> I have 20 rows (samples) split into 6 categories, and 17 columns
(species).
>
> I am getting the following error message, which I don't understand:
>
> > can<-candisc(mod, data=canIN)
> Error in linear.hypothesis.mlm(mod, hyp.matrix.2, SSPE = SSPE, V = V, :
> The error SSP matrix is apparently of deficient rank = 16 < 17
>
> Does anyone has any experience in candisc?
>
> --
> Tanya.
>
>
> [[alternative HTML version deleted]]
>
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