Computational Resources

Due to the nature of survey data analysis, the SURVEYREG procedure requires more memory compared to analysis that uses the same regression model in the GLM procedure. For details about the amount of memory related to the modeling, see the section Computational Resources in Chapter 39, The GLM Procedure.

The memory needed in the SURVEYREG procedure to handle the survey design is described as follows.

Let

• be the total number of strata

• be the total clusters in your sample across all strata if it is a cluster sampling

• be the total number of parameters in the model

The memory needed (in bytes) is

For a cluster sampling, the additional memory needed (in bytes) is

Other small amounts of additional memory are also used by the SURVEYREG procedure. However, when you have large number of clusters or strata, or large number of parameters in your model, the memory described previously dominates the total memory usage in the procedure.