[R] Spatial autocorrelation

Julian Burgos jmburgos at u.washington.edu
Mon Oct 22 20:10:49 CEST 2007

Hi Geertje,

You should look into linear mixed-effects models.  In these you can 
incorporate spatial correlation explicitly.  The basic function to use 
is lme(), but you should do some reading about this type of models 
before jumping into it.  An excellent resource is the book "Mixed 
Effects Models in S and S-Plus" by Jose Pinheiro and Douglas Bates.

Good Luck!


Geertje Van der Heijden wrote:
> Hi,
> I have collected data on trees from 5 forest plots located within the
> same landscape. Data within the plots are spatially autocorrelated
> (calculated using Moran's I). I would like to do a ANCOVA type of
> analysis combining these five plots, but the assumption that there is no
> autocorrelation in the residuals is obviously violated. Does anyone have
> any ideas how to incorporate these spatial effects in my analysis? I
> have been reading up on autoregressive techniques, but I am not sure if
> it works with more than one plot.
> All help is greatly appreciated!
> Many thanks,
> Geertje van der Heijden
> 	[[alternative HTML version deleted]]
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