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

[Maarten de Groot]

Dear Jens,

As far as I understood you are looking for the influence of one distance 
matrix on another. (Please correct me if I am wrong) Than the following 
reference might be useful:

ter Braak, C. J. F. and Schaffers, A. P. 2004: Co-correspondence 
analysis: a new ordination method to relate two community compositions. 
Ecology 85, 834-846.

I don't know whether this is implemented in R, though.

Kind regards,

Maarten

Sarah Goslee wrote:
> That doesn't make much sense to me. You'd need an entirely different method
> than capscale.
>
> Perhaps what you're looking for is more like multiple regression on distance
> matrices (implemented in MRM in ecodist)?
>
>      Lichstein, J. 2007. Multiple regression on distance matrices: A
>      multivariate spatial analysis tool. Plant Ecology 188: 117-131.
>
>      Legendre, P.; Lapointe, F. and Casgrain, P. 1994. Modeling brain
>      evolution from behavior: A permutational regression approach.
>      Evolution 48: 1487-1499.
>
> Sarah
>
> On Tue, Oct 13, 2009 at 11:13 AM, Jens Oldeland <oldeland at gmx.de> wrote:
>   
>> Dear Sarah dear Jari,
>>
>> many thanks for your explanations. However, it wasnt what I thought about,
>> sorry I definitely have to be more specific about the problem.
>>
>> Okay I try be more precise:
>>
>> the problem was that for example  capscale accepts   "capscale(dist.matrix.1
>> ~ N + P + K *Ag, data=varechem)"
>> but I need  "capscale(dist.matrix.1 ~ dist.matrix.2, data=dist.matrix.2)"
>>  so the trick was not on how to create a distance matrix but how to use a
>> second on in a formula.
>>
>> We are trying a similar analysis like the the "distlm" program by Marti
>> Anderson does, however we had a problem with that and wanted to try the
>> analysis in R.
>>
>> thanks already for all your comments !
>>
>> best
>> Jens
>>     
>
>
>
>