Programming the statistical procedures from SAS

Spatial Statistics in PROC MCMC

Posts: 40

Spatial Statistics in PROC MCMC

Hello everybody:

I have been trying to implement bayesian geostatistical spatial analysis in PROC MCMC (using latitude and longitude info). After a couple of days and getting many errors, now I suspected that spatial analysis is not possible in PROC MCMC. I also found the following sentence in the SAS user guide for PROC MCMC:

" The random-effects parameters associated with each subject in the same RANDOM statement are assumed to be conditionally independent of each other, given other parameters and data set variables in the model."

So my RANDOM statement which is

random gamma ~ mvn(mean, cov) subject=cluster_id ;

is wrong, where, mean is zero vector, cov is covariance matrix with a spatial correlation and cluster_id is a variable in the dataset which identifies clusters. I will be thankful if anyone can comment on this. Aren't we really able to do spatial statistics analysis in PROC MCMC? If not, what is your suggestion?

Respected Advisor
Posts: 2,655

Re: Spatial Statistics in PROC MCMC

Perhaps I am missing a key element here, but if the matrix cov accurately reflects a spatial correlation, and is correctly defined in the programming statements, then this should work.  Can you share the entirety of your PROC MCMC code?

Steve Denham

Super User
Posts: 9,775

Re: Spatial Statistics in PROC MCMC

There is a new PROC SSP added into SAS9.4  . Maybe you should take a look at it .

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