Before revision:  We also apply the procedure to reinvestigate two empirical studies: the quantile treatment effect of 401(k) participation on accumulated wealth , and the distributional effect of job-training program participation on trainee earnings .
After revision:  We also apply the procedure to empirically reinvestigate the quantile treatment effect of 401(k) participation on accumulated wealth , and the distributional effect of job-training program participation on trainee earnings .