[R-sig-eco] using two distance metrices in formula

[Sarah Goslee]

And actually, MRM isn't quite part of the Mantel family, although there
are strong mathematical relationships:

Goslee, S. 2009. Correlation analysis of dissimilarity matrices. Plant Ecology.
Online at: http://www.springerlink.com/content/k4051127l6430nr1/
for subscribing institutions.

It isn't a good solution, but rather an attempt to reconcile the different
perspectives mathematically.

Sarah

> There has been a very similar discussion in the Ecology recently between my
> good friends, Hanna Tuomisto & co vs. Pierre Legendre & co. However, the
> point here and above exactly was that you cannot use dissimilarities on the
> RHS (lack of independence), but you must use rectangular data in dbRDA. If
> you use distances on the RHS you won't have dbRDA but you get Mantel family
> methods (like MRM in ecodist). The problem, of course, is how to map
> distances onto Euclidean space (= rectangular data) *and* still study the
> effects of the distances instead of the effects of *location*. I don't know
> any really good solution here, but all proposed solutions have their
> problems. Pierre Legendre, Daniel Borcard and Hanna Tuomisto have all tried
> to convince me of their point of view, and while all their conflicting
> arguments make sense, they are not yet an optimal solution.
>
> Cheers, Jari Oksanen
>>

-- 
Sarah Goslee
http://www.functionaldiversity.org