subject to omitted variable bias despite the inclusion of control variables. If the direction of omitted variable bias were … modest than retrospective studies suggest. Bias appears to be reduced by a differences-in-differences estimator that examines …

This paper considers causal inference and sample selection bias in non-experimental settings in which: (i) few units in … treated units and, hence, in alleviating the bias due to systematic differences between the treated and comparison units …

This paper develops and applies semiparametric econometric methods to estimate the form of selection bias that arises … econometric selection model which represents the bias solely as a function of the probability of participation; and (c) the method … method but find evidence in support of the index-sufficient selection bias model and the assumptions that justify application …

empirical results reject the hypothesis that an increase in the upward bias of the schooling coefficient, due to a change in the …

the spot rate. We use the surveys to decompose the bias into a protion attributable to the risk premium and a portion … attributable to systematic prediction errors. The survey data suggest that our findings of both unconditional and conditional bias …