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Subset (30 <= age <= 39, nonzero income, 9 <= educ < 20) of 2011 KLIPS
data(Klips)
A data frame with 646 rows of 8 variables:
age
years of education
tenure
1 if regular, 0 if irregular
hours worked per week
monthly earning in 10,000 KRW
annual labor income after tax
1 if married