Hello, I might be wrong, but I think it is in degree. Let's consider the length of a degree of longitude at 38N in kilometers: ~88 km
Thus, 40d * 88km = 3520km Hope this helps, Pascal On 5 February 2014 00:43, Alicia <alicia.dalongevi...@cirad.fr> wrote: > 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 > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/correlog-function-in-pgirmess-package-tp4684706.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Pascal Oettli Project Scientist JAMSTEC Yokohama, Japan ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
