g> =1 if in SMSA, 1966</p></li>
<li><p><strong>wage:</strong> hourly wage in cents, 1976</p></li>
<li><p><strong>enroll:</strong> =1 if enrolled in school, 1976</p></li>
<li><p><strong>KWW:</strong> knowledge world of work score</p></li>
<li><p><strong>IQ:</strong> IQ score</p></li>
<li><p><strong>married:</strong> =1 if married, 1976</p></li>
<li><p><strong>libcrd14:</strong> =1 if lib. card in home at 14</p></li>
<li><p><strong>exper:</strong> age - educ - 6</p></li>
<li><p><strong>lwage:</strong> log(wag