Improving the Utility of the DSF Address-based Frame through Ancillary Information
Survey researchers have recently begun using the U.S. Postal Service Delivery Sequence File (DSF) as a sampling frame. In addition to address, the DSF contains ancillary data regarding the status and structure of the address. These ancillary data may prove useful in further enhancing frame construction and sampling methodologies. We review three variables on the DSF: the vacancy flag, the college flag, and the drop point indicator. We conclude that the ancillary information available on the DSF may be used with caution. Despite the limitations, the flags may be used to enhance the current frame.