Why is collinearity in ordination a problem?
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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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 Statistical consultancy, courses, data analysis and software Highland Statistics Ltd. 6 Laverock road UK - AB41 6FN Newburgh Tel: 0044 1358 788177 Email: highstat at highstat.com URL: www.highstat.com URL: www.brodgar.com