Estimating fixed effects: perfect prediction and bias in binary response panel models, with an application to the hospital readmissions reduction prog [...] / Johannes S. Kunz (Monash University), Kevin E. Staub (University of Melbourne and IZA), Rainer Winkelmann (University of Zurich and IZA) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, November 2017