Information needed to administer the OASDI program resides on SSA's Master Beneficiary Record (MBR) file, which in December 2001 contained records for approximately 46 million individuals who were entitled to receive an OASDI benefit for that month. The OASDI Public-Use Microdata File contains an extract of data fields from the MBR and consists of a 1 % random, representative sample of persons entitled to receive an OASDI benefit payment for December 2001. This file contains approximately 460,000 records with 16 data fields on each record.
