Table 1: Data sources used to construct the administrative records composite file.

	Census numident 1936–present	IRS 1040 forms 1969	IRS 1040 forms 1974–1994	SSA master beneficiary record 1962–present
Universe	all SSN holders	all tax filers	all tax filers	SSN holder who earned benefits,
			and spouses	child or spouse receiving benefits
Name	x		x
Alternate Name	x
Date of Birth	x
Date of Death	x
Sex	x
Marital Status		x	x	x
State or country of birth	x
Parents’ names	x
Street address		x	x
County		x	x
SSN	x	x	x	x
Spouse’s SSN			x	x
Child’s SSN				x