CSPATIALREG Procedure

The time and memory that PROC CSPATIALREG requires are proportional to the number of parameters in the model and the number of observations in the data that you are analyzing. Less time and memory are required for smaller models and fewer observations. When you run PROC CSPATIALREG in the high-performance distributed environment, the amount of time that is required is also affected by the number of nodes and the number of threads per node when the optimization task is distributed.

The method that you use to calculate the variance-covariance matrix and the optimization method also affect the time and memory resources. All optimization methods available through the METHOD= option have similar memory use requirements. The processing time might differ among methods, depending on the number of iterations and functional calls that are needed. The data is read into memory to save processing time. If not enough memory is available to hold the data, the CSPATIALREG procedure stores the data in a utility file on disk and rereads the data as needed from this file, substantially increasing the execution time of the procedure. The gradient and the variance-covariance matrix must be held in memory. If the model has p parameters, including the intercept, then you need at least bytes of memory. The processing time is also a function of the number of iterations that are needed to converge to a solution for the model parameters. The number of iterations that are needed cannot be known in advance. You can use the MAXITER= option to limit the number of iterations that PROC CSPATIALREG performs. You can alter the convergence criteria by using the nonlinear optimization options available in the PROC CSPATIALREG statement. For a list of all the nonlinear optimization options, see the section Optimization Control Options.