?? best12. informat suppresses the invalid data NOTE from the log — but _ERROR_ is still set to 1 internally when conversion fails, so the flag remains useful.? best12. suppresses the NOTE but still sets _ERROR_; using ?? suppresses both the NOTE and the invalid data indicator in the log, but _ERROR_ is still set.end=last_row dataset option sets the temporary variable last_row to 1 only on the final observation, allowing the summary PUT to execute exactly once.