
Dear R users,
> I'm actually working on the characterization of spatial distribution 
> patterns of weed species at landscape level.
> The sampling design consists on a systematic grid point (points spaced 
> by 50m) adjusted on a landscape (1km*1km). Weed species were surveyed 
> in plots positionned to each intersection of the grid (400 plots of 
> 4m² at total). I sampled 10 landscapes (1km*1km) and these landscapes 
> are discontinuous at the regional scale (landscapes are each separated 
> by 2km).
> Now, I'd like to compare the distribution of a weed species at the 
> regional scale (containing the 10 landscapes) /versus/ the landscape 
> scale. First, I applied the moran test above all plots (400*10=4000 
> plots). Second, I applied the moran test above the plots of each 
> landscape (400). I fixed the distance between neighbours to 50m. My 
> question is:
> At the regional scale, "landscapes" are discontinuous. So, to apply 
> the moran test on the 4000 plots is valid? Or, the result is just like 
> a I moran weigthed on the 10 landscapes ?
Any help on this will be greatly appreciated,
Best regards,
-- 
Audrey ALIGNIER
/Post doctorante/

Centre INRA de Dijon
UMR 1210 "Biologie et Gestion des Adventices"
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21065 DIJON Cedex - FRANCE
http://www2.dijon.inra.fr/bga/umrbga2009/

Tel:  +33 (0)3 80 69 36 69
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