It never hurts to show the code you are using. That way we can avoid making suggestions that look like what you are doing.   What exactly is the problem? No output, incorrect (or at least unexpected output), missing errors for some records?   From the surveyreg documentation Let H be the total number of strata be the total number of clusters in your sample across all H strata, if you specify a CLUSTER statement p be the total number of parameters in the model The memory needed (in bytes) is For a cluster sample, the additional memory needed (in bytes) is The SURVEYREG procedure also uses other small amounts of additional memory. However, when you have a large number of clusters or strata, or a large number of parameters in your model, the memory described previously dominates the total memory required by the procedure. So using the above information does the memory requirement come close to being within your available.   Also there is the consideration of the output. ODS Select or Exclude might reduce some of the output table overhead.   ... View more