[R-sig-eco] Multivariate ANOVA/repeated measures

[Rich Shepard]

On Mon, 10 Oct 2011, Dave Roberts wrote:

>> I want to compare the results of the two sampling exercises in order to
>> test the performance of the two sampling techniques.

>   I would try something pretty direct. Any appeal to differences in
> dissimilarities confounds the effects with the particular
> dissimilarity/distance matrix you use. Assuming the samples and species
> are in the same order, and that the data.frames are the same size, you
> might try

   I did not read the original message, so I hope you'll allow me to join the
thread. My recommendation is to use univariate tree models, particularly a
classification tree (for ordinal explanatory variables; i.e., ST1 and ST2).

   This is fully, carefully, and non-technically explained in Chapter 9
(particularly Sections 9.3 and 9.4) in Zuur, Ieno, and Smith "Analysing
Ecological Data." For that matter, I highly recommend reading the whole
book.

Rich