inc85 = total earnings of individual i in 1985 (in dollars)
SAT = actual or imputed SAT scores \footnote{Imputed SAT scores are based on ACT scores (when available) or on a battery of tests administered to all NLS72 survey participants.}
HSrank = percentile rank in high school class 
nsib = number of siblings of the respondent (in 1972) 
linc = natural log of parents' income in 1972 
HSwork = number of hours worked per week by the respondent while a high school senior 
Eng = 1 if English is not the primary language spoken in the respondent's home while in high school 
sibcol = 1 if the respondent had one or more siblings in college in 1972 
HSact = 1 the respondent participated in one or more high school clubs or activities (= 0 otherwise))
HSlead = 1 if the respondent was a leader in one or more high school clubs or activities (= 0 otherwise) 
rur72 = 1 if the respondent lived in a rural area in 1972  (= 0 otherwise)
urb72 = 1 if the respondent lived in an urban area in 1972  (= 0 otherwise) 
Catholic = 1 if the respondent is Catholic 
Jewish = 1 if the respondent is Jewish 
mwork = number of months worked at two most recent jobs
ww = total weeks worked during the years 1972-1979
SC = 1 if the individual has completed 1-3 years of college (= 0 otherwise)
CD = 1 if the individual has a B.A. or B.S. degree (= 0 otherwise)
MA = 1 if the individual has a master's degree (= 0 otherwise)
PHD = 1 if the individual has a Ph.D., J.D., MD degree (= 0 otherwise)
NE = 1 if the individual lived in the northeast (= 0 otherwise)
South = 1 if the individual lived in the south (= 0 otherwise)  
Black = 1 if the individual is African-American (= 0 otherwise) 
Asian = 1 if the individual is Asian-American (= 0 otherwise)
Native = 1 if the individual is native American (=0 otherwise)
Hisp = 1 if the individual is Hispanic (= 0 otherwise)
Female = 1 if the individual is female (= 0 otherwise)
MLHS = 1 if the respondent's mother did not finish high school (=0 otherwise)
MSC = 1 if the highest level of education for the respondent's mother is 1-3 years of college (=0 otherwise)
MCD = 1 if the highest level of education for the respondent's mother is a bachelor's degree (=0 otherwise) 
MGRAD = 1 if the respondent's mother completed a graduate degree (=0 otherwise)
FLHS = 1 if the respondent's father did not finish high school (=0 otherwise)
FSC = 1 if the highest level of education for the respondent's father is 1-3 years of college (=0 otherwise)
FCD =  1 if the highest level of education for the respondent's father is a bachelor's degree (=0 otherwise) 
FGRAD = 1 if the respondent's father completed a graduate degree (=0 otherwise)
Married = 1 if the respondent is married in 1986  (= 0 otherwise)
Div = 1 if the respondent is divorced in 1986 (= 0 otherwise)
Nkids = number of children of the respondent
Source: National Longitudinal Study of the High School Class of 1972