The paper evaluates the German health care reform of 1997, using the individual number of doctor visits as outcome measure. A new econometric model, the Probit-Poisson-log-normal model with correlated errors, describes the data better than existing count data models. Moreover, it has an...

The maximum likelihood estimator for the regression coefficients, β, in a panel binary response model with fixed effects can be severely biased if N is large and T is small, a consequence of the incidental parameters problem. This has led to the development of conditional maximum likelihood...

We assess the role played by advisory supervision on the early stage productivity of recent PhDs in economics using a tailor-made data set based on RePEc. After allowing for the potential effects of other relevant determinants, including gender and field of specialisation, we find as expected...