When the donee record is complete, it becomes part of the potential
donor file for younger age groups. For example, consider a white nondisabled continuously
working male age 60 in 1992 as the “donee.” The donor file consists of white nondisabled males
born between 1925 and 1931 who have worked to at least age 60, have some work experience
between ages 55 and 59, and have the same relative age-group earnings ranking at age 60.
From this file a donor record is selected randomly. From the selected donor record the donee
record gets, from age 61, future disability status; relative earnings ratios; ratios of mean agegroup
earnings to economy-wide wages; age of death if the worker dies before receiving old-age
benefits and, if not, the year in which old-age benefits commenced. We begin imputations with
the disability groups, which form roughly 5% of our sample. The disabled form a natural
classification group, and when their profiles are completed they become part of the donor files
for under-65, nondisabled workers, thereby allowing the latter group the possibility of becoming
disability beneficiaries.