Modifies a noun

• regression: Quantile regression allows the measurement of the return to player Players.

• function: We also estimate quantile regression functions to examine how the return to schooling varies across the conditional distribution of earnings.

• plot: Results: The distributions were close to Normal, with less good fit for 5 year completeness, as assessed by quantile plots.

• restriction: This paper considers a linear triangular simultaneous equations model with conditional quantile restrictions.