We characterize the bias of propensity score based estimators of common average treatment effect parameters in the case …

effect having an opposite sign from the true effect. We present an expression for the asymptotic bias of both OLS and IV … estimators and discuss the conditions under which sign reversal may occur. We provide a method for eliminating this bias when …

processes found in most social-science data, such procedures can induce or exacerbate bias, and even inflate the variance … estimates. We term this source of bias ?Iatrogenic? (or econometrician induced) error. Monte Carlo simulations and empirical …

reporting bias that arises if respondents justify being on disability benefits by overstating their work limiting disabilities. …

Social surveys are often used to estimate unemployment duration distributions. Survey nonresponse may then cause a bias … respondents and non-respondents. We develop a method to empirically distinguish between two explanations for a bias in results … both explanations. We discuss implications for standard methods to deal with non-response bias. …