[R-sig-eco] repeated measures ANOVA and PERMANOVA (does it exist?)

[Pedro Pequeno]

Hi,

you could ordinate your observations first (e.g. using NMDS or PCoA), and
then model the resulting scores using location and time as predictors (if
you are interested in estimating their independent effects), or using a
repeated-measures Anova or a GLMM with location as random factor  to
account for within-location autocorrelation.

Just in case, Legendre & Gauthier (2014) discuss several approaches for
space-time analyses (
http://rspb.royalsocietypublishing.org/content/281/1778/20132728.short)

Cheers,

Pedro A. C. L. Pequeno

Em terça-feira, 23 de janeiro de 2018, David Barfknecht <
dfbarfknecht at outlook.com> escreveu:

> Hello all,
>
> I am currently working on a project that uses species occurrence data
> (0/1) to construct an NMDS ordination where some points are the same
> location but through time (10 locations X 3 survey times = 30
> observations). I want to use ANOSIM and PERMANOVA to look at both
> individual locations controlling for time and all survey periods
> controlling for location. Basically, I want to look at location and times
> as separate factors.  I am curious if anyone have ever had to write a
> script for repeated measures ANOSIM and/or PERMANOVA. I am aware of how to
> do the unrepeated measures version of these in the vegan package, but not
> repeated measures versions. Any suggestions?
>
> If not, are there other methods more appropriate to investigate this?
>
> Thank you in advance for any advice.
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
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