[R-sig-Geo] how to generate a trend surface in spdep

[Roger Bivand]

On Thu, 20 Oct 2011, chenliang wang wrote:

> Dear list:
> I am just a newcomer to spatial autoregression.I have a question that
> how to generate a trend surface by means of function lagsarlm() of spdep:
> I have a sample points file, some vector points of independent
> variables,some surfaces of independent variables.I fit a spatial
> autoregression model using function lagsarlm(),and then I get some
> coefficients. How to generate a surface accordling to the simulated
> model? Thank you.
>

The spatial lag model you have chosen is a spatial econometrics model, for 
which prediction and interpolation are not well defined in the literature. 
Interest is rather on the regression coefficients. If you need to predict 
or interpolate, why do you not prefer a geostatistical approach, where the 
regression coefficients are unimportant, but the prediction, possibly of a 
surface, is the main goal?

Hope this clarifies,

Roger

>
>
>
> Chen-Liang Wang
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no