Cross-section data originating from the March 1988 Current Population Survey by the US Census Bureau.
A data frame containing 28,155 observations on 7 variables.
Wage (in dollars per week).
Number of years of education.
Number of years of potential work experience.
Factor with levels
Factor. Does the individual reside in a Standard Metropolitan Statistical Area (SMSA)?
Factor with levels
Factor. Does the individual work part-time?
A sample of men aged 18 to 70 with positive annual income greater than USD 50 in 1992, who are not self-employed nor working without pay. Wages are deflated by the deflator of Personal Consumption Expenditure for 1992.
A problem with CPS data is that it does not provide actual work experience.
It is therefore customary to compute experience as
age - education - 6
(as was done by Bierens and Ginther, 2001), this may be considered potential experience.
As a result, some respondents have negative experience.
Bierens, H.J., and Ginther, D. (2001). Integrated Conditional Moment Testing of Quantile Regression Models. Empirical Economics, 26, 307–324.
Buchinsky, M. (1998). Recent Advances in Quantile Regression Models: A Practical Guide for Empirical Research. Journal of Human Resources, 33, 88–126.
## data and packages library("quantreg") data("CPS1988") CPS1988$region <- relevel(CPS1988$region, ref = "south") ## Model equations: Mincer-type, quartic, Buchinsky-type mincer <- log(wage) ~ ethnicity + education + experience + I(experience^2) quart <- log(wage) ~ ethnicity + education + experience + I(experience^2) + I(experience^3) + I(experience^4) buchinsky <- log(wage) ~ ethnicity * (education + experience + parttime) + region*smsa + I(experience^2) + I(education^2) + I(education*experience) ## OLS and LAD fits (for LAD see Bierens and Ginter, Tables 1-3.A.) mincer_ols <- lm(mincer, data = CPS1988) mincer_lad <- rq(mincer, data = CPS1988) quart_ols <- lm(quart, data = CPS1988) quart_lad <- rq(quart, data = CPS1988) buchinsky_ols <- lm(buchinsky, data = CPS1988) buchinsky_lad <- rq(buchinsky, data = CPS1988)