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Université de Fribourg

On the sensitivity of wage gap decompositions

Huber, Martin ; Solovyeva, Anna

(Working Papers SES ; 497)

This paper investigates the sensitivity of average wage gap decompositions to methods resting on different assumptions regarding endogeneity of observed characteristics, sample selection into employment, and estimators’functional form. Applying five distinct decomposition techniques to estimate the gender wage gap in the U.S. using data from the National Longitudinal Survey of Youth 1979,...

Université de Fribourg

Do German Welfare-to-Work Programmes Reduce Welfare Dependency and Increase Employment?

Huber, Martin ; Lechner, Michael ; Wunsch, Conny ; Walter, Thomas

In: German economic review, 2011, vol. 12, no. 2, p. 182-204

During the last decade, many Western economies reformed their welfare systems with the aim of activating welfare recipients by increasing welfare-to-work programmes (WTWP) and job-search enforcement. We evaluate the short-term effects of three important German WTWP implemented after a major reform in January 2005 (‘Hartz IV’), namely short training, further training with a planned...

Université de Fribourg

Does leaving welfare improve health? Evidence for Germany

Huber, Martin ; Lechner, Michael ; Wunsch, Conny

In: Health economics, 2011, vol. 20, no. 4, p. 484-504

Using exceptionally rich linked administrative and survey information on German welfare recipients we investigate the health effects of transitions from welfare to employment and of assignments to welfare-to-work programmes. Applying semi- parametric propensity score matching estimators we find that employment substantially increases (mental) health. The positive effects are mainly driven by ...

Université de Fribourg

Sensitivity checks for the local average treatment effect

Huber, Martin Huber

In: Economics letters, 2014, vol. 123, no. 2, p. 220-223

The nonparametric identification of the local average treatment effect (LATE) hinges on the satisfaction of three instrumental variable assumptions: (1) Unconfounded assignment of the instrument, (2) no average direct effect of the instrument on the outcome within compliance types (exclusion restric- tion), and (3) weak monotonicity of the treatment in the instrument. While (1) often appears...

Université de Fribourg

Sharp IV bounds on average treatment effects on the treated and other populations under endogeneity and noncompliance

Huber, Martin ; Laffers, Lukas ; Mellace, Giovanni

In: Journal of Applied Econometrics, 2015, vol. 32, no. 1, p. 56-79

In the presence of an endogenous binary treatment and a valid binary instru- ment, causal effects are point identified only for the subpopulation of compliers, given that the treatment is monotone in the instrument. With the exception of the entire population, causal inference for further subpopulations has been widely ignored in econometrics. We invoke treatment monotonicity and/or dominance...

Université de Fribourg

The performance of estimators based on the propensity score

Huber, Martin ; Lechner, Michael ; Wunsch, Conny

In: Journal of econometrics, 2013, vol. 175, no. 1, p. 1-21

We investigate the finite sample properties of a large number of estimators for the average treatment effect on the treated that are suitable when adjustment for observed covariates is required, like inverse probability weighting, kernel and other variants of matching, as well as different parametric models. The simulation design used is based on real data usually employed for the evaluation...

Université de Fribourg

Why do tougher caseworkers increase employment? : The role of programme assignment as a causal mechanism

Huber , Martin ; Lechner, Michael ; Mellace, Giovanni

In: Review of economics and statistics, 2017, vol. 99, no. 1, p. 180-183

Previous research found that less accommodating caseworkers are more success- ful in placing unemployed workers into employment. This paper explores the causal mechanisms behind this result using semiparametric mediation analysis. Analysing rich linked jobseeker-caseworker data for Switzerland, we find that the positive employment effects of less accommodating caseworkers are not driven by a ...

Université de Fribourg

Workplace health promotion and labour market performance of employees

Huber, Martin ; Lechner, Michael ; Wunsch, Conny

In: Journal of health economics, 2015, vol. 43, p. 170-189

This paper investigates the average effects of (firm-provided) workplace health promotion measures in form of the analysis of sickness absenteeism and health circles/courses on labour market out- comes of the firms’ employees. Exploiting linked employer-employee panel data that consist of rich survey- based and administrative information on firms, workers and regions, we apply a flexible...

Université de Fribourg

Identifying causal mechanisms (primarily) based on inverse probability weighting

Huber, Martin

In: Journal of Applied Econometrics, 2014, vol. 29, no. 6, p. 920-943

This paper demonstrates the identification of causal mechanisms of a binary treatment under selection on observables, (primarily) based on inverse probability weighting; i.e. we consider the average indirect effect of the treatment, which operates through an intermediate variable (or mediator) that is situated on the causal path between the treatment and the outcome, as well as the...

Université de Fribourg

Sharp bounds on causal effects under sample selection

Huber, Martin ; Mellace, Giovanni

In: Oxford bulletin of economics and statistics, 2013, vol. 77, no. 1, p. 129-151

In many empirical problems, the evaluation of treatment effects is complicated by sample selection so that the outcome is only observed for a non-random subpopulation. In the absence of instruments and/or tight parametric assumptions, treatment effects are not point identified, but can be bounded under mild restrictions. Previous work on partial identification has primarily focused on the...