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Patent Statistics as Economic Indicators: A Survey

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Econometric Models for Count Data with an Application to the Patents-R & D Relationship

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Environmental Regulation and Innovation: A Panel Data Study

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Determinants of environmental innovation in US manufacturing industries

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Limited-Dependent and Qualitative Variables in Econometrics.

Peter Schmidt, G. S. Maddala · Journal of the American Statistical Association · 1984 · 1.3K citations

Social Sciences, Economics, Econometrics +9