Message-ID: <1395040319077-7585965.post@n2.nabble.com>
Date: 2014-03-17T07:11:59Z
From: Archer_xy
Subject: how to use the jouncount.test for spatial autocorrelation test
I want to test a species' presence / absence records for spatial
autocorrelation. My data contain >130,000 grids in GIS and with about 700
species' presence records.
I have read that the normal Moran's I can't deal with this kind of data, but
that the join count method in package spdep can do it. However, I'm new to R
and I still can't understand the information and code in the help for
joincount.mc or joincount.test.
My data is like this:
gridnumber species
1 1
2 0
3 0
4 1
??
I know how to read a shp.file into R and I know I must calculate the weight
of my data, but the following steps with spdep is beyond my ability.
Any advice in code will be very appreciated.
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