Question: Consider the CPS1988 data, taken from Bierens and Ginther (2001).
(a) Obtain scatterplots of the logarithm of the real wage (wage) versus experience and versus education.
(b) In fact, education corresponds to years of schooling and therefore takes on only a limited number of values. Transform education into a factor and obtain parallel boxplots of wage stratified by the levels of education. Repeat for experience.
(c) The data set contains four additional factors, ethnicity, smsa, region, and parttime. Obtain suitable graphical displays of log(wage) versus each of these factors.