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Hey Folks!

I am new to this list and to using ADE. I have a question about PCA on

Instrumental Variables (I am trying to do a canonical correspondence

analysis).

Here is my question and data. I have 4 different sites where bird surveys

have been done (thus counts of individuals for each species) and at each

site, I have counts of tree canopy patches of different size ranges (each

size range equals a category with a count of the number of objects). I am

trying to use the variation of the counts of tree canopy patches at each

site to explain the variation in bird species counts.

For the bird species data: I have 4 rows (representing each site) and 46

columns (representing each species). = SPECIES

For the tree canopy patch data: I have 4 rows (representing each site) and

11 columns (representing each tree patch size category). = OBJECTS

Here is how I did the analysis:

I first did a COA on SPECIES

I then did a PCA on OBJECTS weighted (by row) by SPECIES.fcpl

I then did a Triplet Orthonormal Basis on OBJECTS.cnta

I then did a PCA on Instrumental Variables:

- the explanatory variable was OBJECTS.@ob (which by the way had 4 rows

and only 3 columns - I was expecting 11?)

- the dependent variable was SPECIES.fcta

- Output file name A

It seemed to run OK but I wanted the column coordinates for the species

(which I got in file A.ivco). But what I DID NOT GET was a file A.ivfa

(which I think should contain the canonical weights which I can use to plot

the gradients for each Patch category - thus the file should have 11 rows

and 2 columns).

I think I need to have both files to plot the normal two dimension graph

with the position of each species with respect to the gradient of each tree

patch category.

What am I doing wrong (or what am I misinterpreting)? I cannot find a file

to plot the gradient of each tree patch category. Thanks ahead of time for

any help.

****************************************************************************

MARK HOSTETLER PHONE: 352-392-1040

223 BARTRAM HALL EMAIL:HOS@ZOO.UFL.EDU

P.O. BOX 118525 FAX: 352-392-3704

DEPARTMENT OF ZOOLOGY

UNIVERSITY OF FLORIDA

GAINESVILLE, FL. 32611

**Next message:**Nicolas Morellet: "A propos du module Maps..."**Previous message:**Daniel Chessel: "Re: Scatters / Values"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

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