[R-sig-eco] Why is collinearity in ordination a problem?

[Highland Statistics Ltd.]

> Dear All
>  
> Looking at examples from Alain Zuur's 'Analysing Ecological Data'- it is apparent that collinearity is considered an issue in ordination.  Could someone explain why that is?
>   

Sorry for sending out two emails....but there is an excellent chapter on 
collinearity in this book:

 A Companion to Theoretical Econometrics (Blackwell Companions to 
Contemporary Economics) (Paperback)
by Prof. Badi Baltagi (Editor)


Alain

>  
> Also is this only the case with a particular format of variable i.e. ordinal but not quantative? 
> Or only with unconstrained vs. constrained ordination?
>  
> Many thanks in advance
>  
> Victoria
>  
> Victoria. J. Ord
> IRES 
> School of Biology
> Devonshire Building
> Newcastle University 
> NE1 7RU 
> +44 (0191) 2464813
>  
>  
>
>
>
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> End of R-sig-ecology Digest, Vol 20, Issue 8
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>   


-- 


Dr. Alain F. Zuur
First author of:

1. Analysing Ecological Data (2007).
Zuur, AF, Ieno, EN and Smith, GM. Springer. 680 p.
URL: www.springer.com/0-387-45967-7


2. Mixed effects models and extensions in ecology with R. (2009).
Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer.
http://www.springer.com/life+sci/ecology/book/978-0-387-87457-9


3. A Beginner's Guide to R (2009).
Zuur, AF, Ieno, EN, Meesters, EHWG. Springer
http://www.springer.com/statistics/computational/book/978-0-387-93836-3


Other books: http://www.highstat.com/books.htm


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