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Université de Fribourg

The Finite Sample Performance of Estimators for Mediation Analysis Under Sequential Conditional Independence

Huber, Martin ; Lechner, Michael ; Mellace, Giovanni

In: Journal of Business & Economic Statistics, 2016, vol. 34, no. 1, p. 139-160

Using a comprehensive simulation study based on empirical data, this article investigates the finite sample properties of different classes of parametric and semiparametric stimators of (natural) direct and indirect causal effects used in mediation analysis under sequential conditional independence assumptions. The estimators are based on regression, inverse probability weighting, and...

Université de Fribourg

Direct and indirect effects based on changes-in-changes

Huber, Martin ; Schelker, Mark ; Strittmatter, Anthony

(Working Papers SES ; 508)

We propose a novel approach for causal mediation analysis based on changes-in- changes assumptions restricting unobserved heterogeneity over time. This allows disentangling the causal effect of a binary treatment on a continuous outcome into an indirect effect operating through a binary intermediate variable (called mediator) and a direct effect running via other causal mechanisms. We...

Université de Fribourg

The effects of gender and parental occupation in the apprenticeship market : an experimental evaluation

Fernandes, Ana ; Huber, Martin ; Plaza, Camila

(Working Papers SES ; 506)

The apprenticeship market is the earliest possible entry into the workforce in developed economies. Since early labor market shocks are likely magnified throughout professional life, avoiding mismatches between talent and occupations e.g. due to gender- or status-based discrimination appears crucial. This experimental study investigates the effects of applicant gender and its interaction with...

Université de Fribourg

An introduction to flexible methods for policy evaluation

Huber, Martin

(Working Papers SES ; 504)

This chapter covers different approaches to policy evaluation for assessing the causal effect of a treatment or intervention on an outcome of interest. As an introduction to causal inference, the discussion starts with the experimental evaluation of a randomized treatment. It then reviews evaluation methods based on selection on observables (assuming a quasi-random treatment given observed...

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...