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Econometric Models for Count Data with an Application to the Patents-R&D Relationship
Hausman, Jerry A., (1984)
Hausman, Jerry A., (2021)
Count data stochastic frontier models, with an application to the patents-R&D relationship
Fé, Eduardo, (2013)
Characteristics of Demand for Pharmaceutical Products: An Examination of Four Cephalosporins
Fisher, Sara Ellison, (1997)
Patents and R&D : Is There A Lag?
Hall, Bronwyn H., (1984)
Errors in Variables in Panel Data
Griliches, Zvi, (2021)