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Consortium of Swiss Academic Libraries

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

Université de Fribourg

Do Anti-Corruption Educational Campaigns Reach Students? : Evidence from Russia and Ukraine

Denisova-Schmidt, Elena ; Huber, Martin ; Leontyeva, Elvira

In: Educational studies. Moscow, 2016, no. 1, p. 61-83

The authors investigate the effect of anti-corruption educational materials — an informational folder with materials designed by Transparency International — on the willingness of students to participate in an anti-corruption campaign and their general judgment about corruption in two cities in Russia and Ukraine by conducting experiments. During a survey of 350 students in Khabarovsk,...

Université de Fribourg

Local Average Treatment Effects with or Without Defiers

Dahl, Christian M. ; Huber, Martin ; Mellace, Giovanni

In: Discussion papers on business and economics, 2017, vol. 2, p. 1-69

In heterogeneous treatment effect models with endogeneity, identification of the LATE typically relies on the availability of an exogenous instrument monotonically related to treatment participation. We demonstrate that a strictly weaker local monotonicity condition identifies the LATEs on compliers and on defiers. We propose simple estimators that are potentially more efficient than 2SLS,...

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

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

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...

Université de Fribourg

A review of causal mediation analysis for assessing direct and indirect treatment effects

Huber, Martin

(Working Papers SES ; 500)

Mediation analysis aims at evaluating the causal mechanisms through which a treatment or intervention affects an outcome of interest. The goal is to disentangle the total treatment effect into an indirect effect operating through one or several observed intermediate variables, the so-called mediators, as well as a direct effect reflecting any impact not captured by the observed mediator(s)....

Université de Fribourg

The effects of anti-corruption videos on attitudes towards corruption in a Ukrainian online survey

Denisova-Schmidt, Elena ; Huber, Martin ; Prytula, Yaroslav

(Working Papers SES ; 499)

This paper presents the outcomes of an anti-corruption educational intervention among Ukrainian students based on an online experiment. More than 3,000 survey participants were randomly assigned to one of three different videos on corruption and its consequences (treatment groups) or a video on higher education (control group). The data suggest a high level of academic dishonesty and...

Université de Fribourg

Direct and indirect treatment effects - causal chains and mediation analysis with instrumental variables

Fröhlich, Markus ; Huber, Martin

In: Journal of the Royal Statistical Society Series B, 2017, vol. 79, no. 5, p. 1645-1666

The paper discusses the non‐parametric identification of causal direct and indirect effects of a binary treatment based on instrumental variables. We identify the indirect effect, which operates through a mediator (i.e. intermediate variable) that is situated on the causal path between the treatment and the outcome, as well as the unmediated direct effect of the treatment by using distinct...