[R-sig-Geo] Moran I with Edge effect correction

[Roger Bivand]

On Thu, 23 Aug 2012, Kitty Lee wrote:

> Hi. I have some study areas that are very irregularly shaped. I wonder 
> if there is a way to adjust for edge effect in computing Moran's I or 
> Geary C?

The typical approach would be through the weights matrix, depending on how 
W is constructed. If you row-standardise, edge observations will be 
stressed, but with binary weights they are less salient. You could also 
intervene directly to reduce weights on observations selected as members 
of an edge set, through the glist= argument in nb2listw().

Hope this helps,

Roger

>
> Any leads would be really appreciated.
>
> K.
>
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-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no