SAS Watchout

Is the output from espfilt in SAS 19.1.0 reliable?

Errors have been found with the espfilt (v3.4.4) task which ran under SAS 19.1.0.

A comprehensive update of the task was made for SAS 20 (espfilt v4.3) and it is recommended to use espfilt Version 4.3 or later in your analysis.