person identifier
92, 95, or 99
annual salary, $
publication index
standardized total article pages
=1 if assistant professor
=1 if associate professor
=1 if full professor
=1 if department chair
=1 if Ph.D. from top 20 dept.
year Ph.D. obtained
=1 if female
=1 if Ohio State U.
=1 if U. Iowa
=1 if Indiana U.
=1 if Purdue U.
=1 if Michigan State U.
=1 if U. Minnesota
=1 if U. Michigan
=1 if U. Wisconsin
=1 if U. Illinois
=1 if year == 92
=1 if year == 95
=1 if year == 99
log(salary)
years since first teaching job
exper^2
pubindx^2
=1 if pubindx == 0
log(pubindx) if pubindx > 0