[R] correlog function in pgirmess package
Alicia
alicia.dalongeville at cirad.fr
Tue Feb 4 16:43:10 CET 2014
Dear R-help,
I used the correlog function of pgirmess package to create a spatial
correlogram for Moran's I.
The function gives Moran's coefficient with a p value for each distance
class. My question is what is the unit for the distance classes?
Here is the outcome of the function:
Moran I statistic
dist.class coef p.value n
[1,] 1.283804 -0.0127393244 0.62182018 3288
[2,] 3.851412 -0.0070005170 0.53767024 5642
[3,] 6.419020 -0.0020360457 0.41371395 6546
[4,] 8.986627 0.0173943620 0.07212314 5814
[5,] 11.554235 -0.0225794695 0.84271228 4918
[6,] 14.121842 -0.0050324772 0.49452160 3372
[7,] 16.689450 -0.0007194256 0.42712852 2232
[8,] 19.257058 -0.0162570231 0.60272799 1242
[9,] 21.824665 -0.0330641732 0.74239660 1208
[10,] 24.392273 0.0602675483 0.09440368 508
[11,] 26.959881 -0.0007420201 0.43708138 270
[12,] 29.527488 0.0765320993 0.10876925 190
[13,] 32.095096 -0.0046161786 0.44659399 142
[14,] 34.662703 -0.0797066199 0.61910376 58
[15,] 37.230311 -0.7840212074 0.99986700 28
[16,] 39.797919 -0.7770962373 0.99839965 18
I first thought the distance unit was kilometers but the dist.class are only
going until 40 and my data are taken from all around the Mediterranean sea
(about 3700km long) so it cannot be right.
In the correlog help it is said that "Distances are in the same unit as the
spatial coordinates" but I don't get what that means. I gave spatial
coordinates in decimal degree.
It must be very simple but I was not able to find the answer anywhere.
Thanks for your help,
Cheers,
Alicia
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