In this paper, we present a nonparametric comparative efficiency analysis of 179 communal public transport bus companies in Germany (1990-2004). We apply both deterministic data envelopment analysis (DEA) and bootstrapping to test the robustness of our estimates and to test the hypothesis of...

In this paper we investigate the existence and shape of the Environmental Kuznets Curve (EKC) by means of nonparametric methods. We also investigate the issues involved in the choice of nonparametric estimator. We find that the nature of the economic relationship and the quality of environmental...

Directional distances provide useful, flexible measures of technical efficiency of production units relative to the efficient frontier of the attainable set in input-output space. In addition, the additive nature of directional distances permits negative input or outputs quantities. The choice...

We assess the impact of the sovereign risk spill-overs onto corporate cost of borrowing in selected euro area countries. We utilize a novel nonparametric dependence filtering frame- work to remove the effects of sovereign risk in the interest rate pass-through context. The main findings confirm...

Summary This note investigates the structure of dominance relations in daily returns of 32 German assets during the 1990s. We focus on stochastic dominance of first, second and third order but meanvariance and mean-Gini dominance is also considered. Efficient (i. e., nondominated) sets of assets...

This paper deals with different concepts of income elasticities of demand for a heterogenous population and the relationship between individual and aggregate elasticities is analyzed. In general, the aggregate elasticity is not equal to the mean of individual elasticities. The difference depends...

Functional data analysis can be challenging when the functional objects are sampled only very sparsely and unevenly. Most approaches rely on smoothing to recover the underlying functional object from the data which can be difficult if the data is irregularly distributed. In this paper we present...

This paper identifies sharp bounds on the mean treatment response and average treatment effect under the assumptions of both concave monotone treatment response (concave-MTR) and monotone treatment selection (MTS). We use our bounds and the US National Longitudinal Survey of Youth to estimate...