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Frank Windmeijer (1997). Endogeneity in count data models: An application to demand for health care Journal of Applied Econometrics.
Frank Windmeijer (1997). Endogeneity in count data models: An application to demand for health care Journal of Applied Econometrics.
Frank Windmeijer (1997). An R-squared measure of goodness of fit for some common nonlinear regression models Journal of Econometrics.