robustness using quasi-experiments. The analysis pertains to sign, size andsignificance of the effects, and we relax the quasi …

-systematic impact of omitted variable bias in primary studies. Our results show that the mixed effects estimator is to be preferred to … non-systematic impact of omitted variable bias, using the mixed effects estimator may be suboptimal. We also address the …

We propose a first order bias correction term for the Gini index to reduce the bias due to grouping. The first order … reveals an intuitive formula for the remaining second order bias which is useful in empirical analyses. We analyze the … it reduces a considerable share of the bias due to grouping. …

the measurement error. The standard attenuation bias suggests that using these corrected data would lead to a higher …