The probit models are estimated with data from the first and third waves of the
HRS fielded in 1992 and 1996, specifically the public release version of wave 1
and the alpha release version of wave 3.The analysis is restricted to age-eligible
men who were working full-time as of wave 1 and who are not lost due to attrition
or death in wave 3, a total sample of 2638 men.2