[R-sig-eco] Manova repeated measures

[Nicholas Lewin-Koh]

Hi,
Yep, you seem to have more behaviors than observations. 
"Error in anova.mlm(object) : residuals have rank 70 < 72"
is the clue.

On top of that be aware that MANOVA has very strong assumptions about
the covariance structure. You may want to look into a mixed modeling 
approach.

A solution is to look at your behaviors, which should be highly
correlated? 
And try some dimension reduction techniques. eg Factor analysis or PCA
Then fit your anova model to the interesting components. 

Nicholas
 Date: Thu, 13 May 2010 14:24:05 -0400 (EDT)
> From: Allan Edelsparre <aedelspa at uoguelph.ca>
> To: r-sig-ecology <r-sig-ecology at r-project.org>
> Subject: [R-sig-eco] Manova repeated measures
> Message-ID:
> 	<194243757.17724471273775045711.JavaMail.root at huron.cs.uoguelph.ca>
> Content-Type: text/plain; charset=utf-8
> 
> Hi all,
> 
> I am in a situation where I want to ask what is the effect of ecomorph,
> diet, and family(nested in ecomorph) on a number of behaviours that are
> repeated measures.  I use the Car package to run the MANOVA and it worked
> on my previous data set.  However, on this new data set I get the
> following error:
> 
> 
> > av.mod2<- anova(model2, idata=idata, idesign=~time)
> 
> Error in anova.mlm(object) : residuals have rank 70 < 72
> In addition: Warning message:
> In function (object, ..., test = c("Pillai", "Wilks", "Hotelling-Lawley",
>  :
>   models with response "NULL" removed because response differs from model
>   1
> 
> I have a large number of behaviours included could this be the problem?
> 
> Does anyone have any idea what might be going on?
>  
> Allan
> 
> 
> 
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> End of R-sig-ecology Digest, Vol 26, Issue 8
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