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Université de Fribourg

Testing for covariate balance using quantile regression and resampling methods

Huber, Martin

In: Journal of applied statistics, 2011, vol. 38, no. 12, p. 2881-2899

Consistencyofpropensityscorematchingestimatorshingesonthepropensityscore’sabilityt obalancethe distributions of covariates in the pools of treated and non-treated units. Conventional balance tests merely check for differences in covariates’means, but cannot account for differences in higher moments. For this ...

Université de Fribourg

Treatment evaluation in the presence of sample selection

Huber, Martin

In: Econometric reviews, 2014, vol. 33, no. 8, p. 869-905

Sample selection and attrition are inherent in a range of treatment evaluation problems such as the estimation of the returns to schooling or training. Conventional estimators tackling selection bias typically rely on restrictive functional form assumptions that are unlikely to hold in reality. This paper shows identification of average and quantile treatment effects in the presence of the...

Université de Fribourg

Regional differences in perceived corruption among Ukrainian firms

Denisova-Schmidt, Elena ; Huber , Martin

In: Eurasian geography and economics, 2014, vol. 55, no. 1, p. 10-36

This paper investigates regional differences in the perception of corruption and informal practices among Ukrainian firms. Using two different data sets from Ukraine, we show that perceived corruption differs significantly across regions, even when taking into account the size, industry, workforce composition, and other characteristics of the firms based on propensity score matching. In...

Université de Fribourg

Testing exclusion restrictions and additive separability in sample selection models

Huber, Martin ; Mellace, Giovanni

In: Empirical economics, 2014, vol. 47, no. 1, p. 75-92

Standard sample selection models with non-randomly censored outcomes assume (i) an exclusion restriction (i.e., a variable affecting selection, but not the outcome) and (ii) additive separability of the errors in the selection process. This paper proposes tests for the joint satisfaction of these assumptions by applying the approach of Huber and Mellace (Testing instrument validity for LATE...

Université de Fribourg

Treatment Evaluation With Multiple Outcome Periods Under Endogeneity and Attrition

Fröhlich , Markus ; Huber , Martin

In: Journal of the American Statistical Association, 2014, vol. 109, no. 508, p. 1697-1711

This article develops a nonparametric methodology for treatment evaluation with multiple outcome periods under treatment endogeneity and missing outcomes. We use instrumental variables, pretreatment characteristics, and short-term (or intermediate) outcomes to identify the average treatment effect on the outcomes of compliers (the subpopulation whose treatment reacts on the instrument) in...

Université de Fribourg

Causal Pitfalls in the Decomposition of Wage Gaps

Huber , Martin

In: Journal of business & economic statistics, 2015, vol. 33, no. 2, p. 179-191

The decomposition of gender or ethnic wage gaps into explained and unexplained components (often with the aim to assess labor market discrimination) has been a major research agenda in empirical labor economics. This article demonstrates that conventional decompositions, no matter whether linear or nonparametric,areequivalenttoassuminga(probablytoo)simplemodelofmediation(aimed atassessing...

Université de Fribourg

Radius matching on the propensity score with bias adjustment : tuning parameters and finite sample behaviour

Huber, Martin ; Lechner, Michael ; Steinmayr, Andreas

In: Empirical economics, 2015, vol. 49, no. 1, p. 1-31

Using a simulation design that is based on empirical data, a recent study by Huber et al. (J Econom 175:1–21, 2013) finds that distance-weighted radius matching with bias adjustment as proposed in Lechneret et al. (J Eur Econ Assoc 9:742–784, 2011) is competitive among a broad range of propensity score-based estimators used to correct for mean differences due to observable covariates. In...