[R] correlog function in pgirmess package

[Alicia]

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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