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List:       r-sig-geo
Subject:    [R-sig-Geo] biivariate moran
From:       <Kate.Searle () csiro ! au>
Date:       2006-08-13 3:05:11
Message-ID: 062AE320EF971E40ACD0F6C93391D769932C50 () exqld1-tsv ! nexus ! csiro ! au
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Hi Luc,

I have been using GEODA to compute bivariate Moran's I to examine
spatial correlations between various plant and soil variables I have
collected. I am favouring the use of a bivariate Moran's I over
cross-correlograms as my plots are very small (5m x 5m) and there is not
much spatial structure on this scale in my system. It is, therefore,
nice to be able to use the threshold weighting capability in GEODA to
compare values of one variable with another over certain threshold
distances, rather than using spatial lag distances. Could you perhaps
point me in the direction of a reference that gives explicit methods for
how GEODA makes these computations? (i.e. does GEODA use Wartenberg's
bivariate Moran's I? how are points near the sample point weighted
(1/d?) etc).

Thanks so much

Kate

 

Kate Searle

Post Doctoral Fellow

CSIRO - Sustainable Ecosystems

Davies Lab

PMB PO Aitkenvale

Queensland 4814

Australia

kate.searle@csiro.au

61 7 4753 8564

 

We shall not cease from exploration

And the end of all our exploring

Will be to arrive where we started

And know the place for the first time

T. S. Elliot

 


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