Same spatial autocovariate values for different distances
I am trying to correct spatial autocorrelation of model residuals, which i found after making correlograms of the residuals of my model. I found autocorrelation at small scales lower than 200m, and at 5 km. To correct for it i am using the autocov_dist function from package spdep, using different distances lke this:
ac1<-autocov_dist(variable, coord, nbs=500, type="inverse")
ac2<-autocov_dist(variable, coord, nbs=100, type="inverse")
ac3<-autocov_dist(variable, coord, nbs=5500 type="inverse")
I wasn't sure at the beggining about distance units for nbs, so i tried 0.5, 1, and 5.5. It always gives the same value for the resulting autocovariate. Just decreasing the distance until 0.1, i get different values.
When I use the autocovariate obtained with nsb=0.1, effectively spatial autocorrelation at that scale is corrected, but using the other autocovariate (which is the same for all other distances) autocorrrelation at higher scales isn't corrected.
What am i missing here? Has someone any clue?
Many thanks in advance!
spatial
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
add a comment |
I am trying to correct spatial autocorrelation of model residuals, which i found after making correlograms of the residuals of my model. I found autocorrelation at small scales lower than 200m, and at 5 km. To correct for it i am using the autocov_dist function from package spdep, using different distances lke this:
ac1<-autocov_dist(variable, coord, nbs=500, type="inverse")
ac2<-autocov_dist(variable, coord, nbs=100, type="inverse")
ac3<-autocov_dist(variable, coord, nbs=5500 type="inverse")
I wasn't sure at the beggining about distance units for nbs, so i tried 0.5, 1, and 5.5. It always gives the same value for the resulting autocovariate. Just decreasing the distance until 0.1, i get different values.
When I use the autocovariate obtained with nsb=0.1, effectively spatial autocorrelation at that scale is corrected, but using the other autocovariate (which is the same for all other distances) autocorrrelation at higher scales isn't corrected.
What am i missing here? Has someone any clue?
Many thanks in advance!
spatial
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
add a comment |
I am trying to correct spatial autocorrelation of model residuals, which i found after making correlograms of the residuals of my model. I found autocorrelation at small scales lower than 200m, and at 5 km. To correct for it i am using the autocov_dist function from package spdep, using different distances lke this:
ac1<-autocov_dist(variable, coord, nbs=500, type="inverse")
ac2<-autocov_dist(variable, coord, nbs=100, type="inverse")
ac3<-autocov_dist(variable, coord, nbs=5500 type="inverse")
I wasn't sure at the beggining about distance units for nbs, so i tried 0.5, 1, and 5.5. It always gives the same value for the resulting autocovariate. Just decreasing the distance until 0.1, i get different values.
When I use the autocovariate obtained with nsb=0.1, effectively spatial autocorrelation at that scale is corrected, but using the other autocovariate (which is the same for all other distances) autocorrrelation at higher scales isn't corrected.
What am i missing here? Has someone any clue?
Many thanks in advance!
spatial
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
I am trying to correct spatial autocorrelation of model residuals, which i found after making correlograms of the residuals of my model. I found autocorrelation at small scales lower than 200m, and at 5 km. To correct for it i am using the autocov_dist function from package spdep, using different distances lke this:
ac1<-autocov_dist(variable, coord, nbs=500, type="inverse")
ac2<-autocov_dist(variable, coord, nbs=100, type="inverse")
ac3<-autocov_dist(variable, coord, nbs=5500 type="inverse")
I wasn't sure at the beggining about distance units for nbs, so i tried 0.5, 1, and 5.5. It always gives the same value for the resulting autocovariate. Just decreasing the distance until 0.1, i get different values.
When I use the autocovariate obtained with nsb=0.1, effectively spatial autocorrelation at that scale is corrected, but using the other autocovariate (which is the same for all other distances) autocorrrelation at higher scales isn't corrected.
What am i missing here? Has someone any clue?
Many thanks in advance!
spatial
spatial
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
asked Nov 23 '18 at 21:09
Ana PrietoAna Prieto
134
134
add a comment |
add a comment |
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