[R-sig-eco] vegan::adonis, SS, order of terms
osoong+r at gmail.com
Wed Feb 1 18:48:06 CET 2012
Thanks for reminding me about the behavior of stats::anova under
unbalanced designs. I had forgotten that equations 5 and 6 in
Anderson 2001 are only for balanced designs.
On Wed, Feb 1, 2012 at 2:40 AM, Jari Oksanen <jari.oksanen at oulu.fi> wrote:
> On 01/02/2012, at 06:52 AM, Oliver Soong wrote:
>> Are the vegan::adonis sums of squares supposed to depend on the order of the
> Yes, the terms are added sequentially, just like in ordinary R anova, and they are order-dependent. The next release version of vegan will show this information (I just committed the change to R-Forge).
>> I'm trying to understand permutational MANOVA, and this
>> disagrees with my reading of Anderson 2001.
>> adonis(dune ~ A1 + Management, dune.env)
>> adonis(dune ~ Management + A1, dune.env)
> So *how* does this disagree with your reading?
> Cheers, Jari Oksanen
> Jari Oksanen, Dept Biology, Univ Oulu, 90014 Finland
More information about the R-sig-ecology