We consider a general sample selection model where unit and item nonresponse simultaneously affect a regression relationship of interest, and both types of nonresponse are potentially correlated. We estimate both parametric and semiparametric specifications of the model. The parametric...

In this paper, we estimate income elasticities and investigate the determinants of alcohol and tobacco consumption in Lesotho using a Double-Hurdle model on the 2002/03 Lesotho HBS data. The results reveal that both alcohol and tobacco are income inelastic with estimated elasticities of 0.6553...

Increased energy efficiency is often seen as the best way of reducing energy consumption. However, the cost reduction resulting from the efficiency increase can undermine the energy-saving potential of the efficiency measures. In this study, we develop a method for decomposing the behavioral...

The control function in the semiparametric selection model is zero at infinity. This paper proposes additional restrictions of the same type and shows how to use them to test assumed exclusion restrictions necessary for root N estimation of the model. The test is based on the estimated control...

Background: In duration analysis, we find situations where covariates are simultaneously determined along with the duration variable. Moreover, although the models based on a hazard rate do not explicitly assume heterogeneity, in applied econometrics, the possibility of omitted variables is...

This paper considers the shape invariant modelling approach in semiparametric regression estimation. Nonparametric functions of similar shape are linked by parametric transformations with unknown parameters. A computationally convenient estimation procedure is suggested. √N- consistency of the...

This paper studies the link between productivity, innovation and research at the firm level. We introduce three new features: (i) A structural model that explains productivity by innovation output, and innovation output by research investment; (ii) New data on French manufacturing firms,...