Heterogeneous effects are prevalent in many economic settings. As the functional form between outcomes and regressors is generally unknown a priori, a semiparametric negative binomial count data model is proposed which is based on the local likelihood approach and generalized product kernels....

Theoretical considerations suggest that nonlinear health care price schedules have heterogeneous effects on health care demand. In this paper, we develop and apply a finite mixture bivariate probit model to analyze whether there are heterogeneous reactions to the introduction of a nonlinear...

Abstract ; Background: The health care reform of 2004 was intended to reduce moral hazard in the statutory health insurance through various financial incentives. An important element of the reform has been the introduction of a per-quarter fee for doctor visits. The second part of the reform has...