We assess selection bias in estimated returns to workplace training by exploiting a field experiment with random …-experimental estimates that are estimated by using a sample of agents who were selected by management not to participate in the experiment …. When controlling for pre-treatment performance or individual fixed effects, only about one tenth of this bias remains and …

We assess selection bias in estimated returns to workplace training by exploiting a field experiment with random …-experimental estimates that are estimated by using a sample of agents who were selected by management not to participate in the experiment …. When controlling for pre-treatment performance or individual fixed effects, only about one tenth of this bias remains and …

integrity of the experiment protocol. We find a series of coding, measurement and sampling errors. Correcting the identified … implausible impacts at the endline. Our re-analysis focused on the lack of internal validity of this experiment, but several of …

We assess selection bias in estimated returns to workplace training by exploiting a field experiment with random …-experimental estimates that are estimated by using a sample of agents who were selected by management not to participate in the experiment …. When controlling for pre-treatment performance or individual fixed effects, only about one tenth of this bias remains and …

part remains testable under the experiment even in the presence of randomisation bias, and offers a way to correct the non …We highlight the importance of randomisation bias, a situation where the process of participation in a social … experiment has been affected by randomisation per se. We illustrate how this has happened in the case of the UK Employment …

", and provide what is to our knowledge the first empirical evidence on this form of bias in an actual social experiment, the … individuals might react to the randomisation itself, thereby rendering the causal inference from the experiment irrelevant for … policy purposes. In this paper we set out a theoretical framework for the systematic consideration of "randomisation bias …