We consider the problem of choosing two bandwidths simultaneously for estimating the difference of two functions at given points. When the asymptotic approximation of the mean squared error (AMSE) criterion is used, we show that minimisation problem is not well-defined when the sign of the...

A new bandwidth selection method that uses different bandwidths for the local linear regression estimators on the left and the right of the cut-off point is proposed for the sharp regression discontinuity design estimator of the average treatment effect at the cut-off point. The asymptotic mean...

Previous studies have found that self-employed workers with long business tenure earn less than other workers with similar characteristics. This difference in earnings can be explained by the compensating wage differential theory when self-employed jobs have attractive non-earnings aspects....

Short panel data sets constructed by matching individuals across monthly files of the Current Population Survey (CPS) have been used to study a wide range of questions in labor economics. Such panels offer unique advantages. But because the CPS makes no effort to follow movers, these panels...

We examine the impacts of the minimum wage on employment using the minimum-wage hike induced by the introduction of indexation of the local minimum wage to the local cost of living. The revision of the Minimum Wage Act in 2007 of Japan essentially required the government to set the minimum wage...