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A drawback with national register studies has been that, as they cannot control for selection bias, it is possible that some selected groups of patients are given a specific treatment more often than others; for example, patients who are older or more unwell could be given a different type of implant, antithrombotic or antibiotic prophylaxis.
26Other attempts to control for selection (such as with high school GPA) generate similar results.
However, as training is endogenous, we have to control for selection bias both on observables and on unobservables.
A complete set of estimates for the model with no control for selection are available from the authors upon request.
This study does not control for selection effects – neither selection into prison nor selection into need for treatment.
In addition, a two-step Heckman correction was used to control for selection bias induced by protest responses.
The tests are preliminary because there is too little variation among our policy variables to control for selection.
Using propensity score methods to control for selection, we do not find evidence of differential outcomes by admission to SU or other wards.
Finally, since participation in the labor market is not random, we try to control for selection to obtain unbiased estimates of the gender wage gap.
Most importantly, we also implemented the endogenous switching regression (ESR) model to check the consistency of the PSM result to control for selection bias.
Lastly, we control for selection at exit with a survival model, which also explicitly accommodates for the structure of our dependent variable.
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