name of dataset: card
no of variables: 34
no of observations: 3010

+----------+--------------------------------+
| variable | label                          |
+----------+--------------------------------+
| id       | person identifier              |
| nearc2   | =1 if near 2 yr college, 1966  |
| nearc4   | =1 if near 4 yr college, 1966  |
| educ     | years of schooling, 1976       |
| age      | in years                       |
| fatheduc | father's schooling             |
| motheduc | mother's schooling             |
| weight   | NLS sampling weight, 1976      |
| momdad14 | =1 if live with mom, dad at 14 |
| sinmom14 | =1 if with single mom at 14    |
| step14   | =1 if with step parent at 14   |
| reg661   | =1 for region 1, 1966          |
| reg662   | =1 for region 2, 1966          |
| reg663   | =1 for region 3, 1966          |
| reg664   | =1 for region 4, 1966          |
| reg665   | =1 for region 5, 1966          |
| reg666   | =1 for region 6, 1966          |
| reg667   | =1 for region 7, 1966          |
| reg668   | =1 for region 8, 1966          |
| reg669   | =1 for region 9, 1966          |
| south66  | =1 if in south in 1966         |
| black    | =1 if black                    |
| smsa     | =1 in in SMSA, 1976            |
| south    | =1 if in south, 1976           |
| smsa66   | =1 if in SMSA, 1966            |
| wage     | hourly wage in cents, 1976     |
| enroll   | =1 if enrolled in school, 1976 |
| KWW      | knowledge world of work score  |
| IQ       | IQ score                       |
| married  | =1 if married, 1976            |
| libcrd14 | =1 if lib. card in home at 14  |
| exper    | age - educ - 6                 |
| lwage    | log(wage)                      |
| expersq  | exper^2                        |
+----------+--------------------------------+

D. Card (1995), "Using Geographic Variation in College Proximity to
Estimate the Return to Schooling," in Aspects of Labour Market
Behavior: Essays in Honour of John Vanderkamp. Ed. L.N. Christophides,
E.K. Grant, and R. Swidinsky, 201-222. Toronto: University of Toronto
Press. Professor Card kindly provided these data.