Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This study investigates the identification of parameters in semiparametric binary response models of the form y=1(x′β+v+ε>0) when there are nonignorable nonresponses. We propose an estimation procedure for the identified set, the set of parameters that are observationally indistinguishable from the true value β, based on the special regressor approach of Lewbel (2000). We show that the estimator for the identified set is consistent in the Hausdorff metric.