| ww | = total weeks worked 1979-1995 |
| inc95 | = respondent's total wage and salary income for 1995 |
| afqt | = percentile score on U.S. Armed Forces Qualifying Exam |
| yeared | = years of education completed by the respondent |
| med | = years of education completed by the respondent's mother |
| fed | = years of education completed by the respondent's father |
| female | = 1 if the respondent is female (=0 otherwise) |
| black | = 1 if the respondent is black (=0 otherwise) |
| hisp | = 1 if the respondent is Hispanic (=0 otherwise) |
| asian | = 1 if the respondent is Asian (=0 otherwise) |
| natamer | = 1 if the respondent is native American (=0 otherwise) |
| health | = 1 if the respondent has a health condition that
interferes with his or her ability to work (=0 otherwise) |
| ne | = 1 if the respondent lived in the northeast in 1996 (=0 otherwise) |
| nortcent | = 1 if the respondent lived in the north central states in 1996 (=0 otherwise) |
| south | = 1 if the respondent lived in the south in 1996 (=0 otherwise) |
| rural | = 1 if the respondent lived in a rural area in 1996 (=0 otherwise) |
| aa | = 1 if the respondent's highest level of education is an AA or AS degree (=0 otherwise) |
| ba | = 1 if the respondent's highest level of education is a BA degree (=0 otherwise) |
| bs | = 1 if the respondent's highest level of education is a BS degree (=0 otherwise) |
| masters | = 1 if the respondent's highest level of education is an MA or MS degree (=0 otherwise) |
| phd | = 1 if the respondent's highest level of education is a PhD (or equivalent) degree (=0 otherwise) |
| profdeg | = 1 if the respondent's highest level of education is an MD, LLD, DDS (or equivalent) degree (=0 otherwise) |
The sample consists of 3614 individuals who reported wage and/or salary earnings for 1995 and provided responses to the questions needed to construct the variables listed above.
