Re: [R-sig-Geo] Simulating spatially autocorrelated data

2011-09-06 Thread Downey, Patrick
I'm looking for some guidance on how to select the appropriate distance threshold when I don't know the true rho (that is, with non-simulated data). Thanks, Mitch -Original Message- From: Roger Bivand [mailto:roger.biv...@nhh.no] Sent: Thursday, September 01, 2011 2:20 PM

[R-sig-Geo] Simulating spatially autocorrelated data

2011-09-01 Thread Downey, Patrick
Hello all, I'm trying to simulate a spatially autocorrelated random variable, and I cannot figure out what the problem is. All I want is a simple spatial lag model where Y = rho*W*Y + e Where e is a vector of iid normal random variables, rho is the autocorrelation, W is a row-normalized distance

[R-sig-Geo] Spatio-Temporal Models

2011-04-01 Thread Downey, Patrick
Hello, I'm looking to estimate some spatio-temporal regressions controlling for spatial and temporal autocorrelation and with a few independent variables. The package {Stem} has exactly what I want, except my data is measured in polygons, not at points. Is there a package which can estimate these