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Econometric models for count data with an application to the patents-R&D relationship

, , and . Econometrica, 52 (4): 909--938 (1984)

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R-&-D tax policy during the eighties. Working paper National Bureau of Economic Research, Cambridge, Mass., (1992)Adoption of New Technology, and . Working Paper, 9730. National Bureau of Economic Research, 1050 Massachusetts Avenue, Cambridge, MA 02138, (May 2003)Software for the computation of Tobit model estimates. Journal of Econometrics, 24 (1-2): 215--222 (00 1984)Exploring the relationship between R&D and productivity in French manufacturing firms, and . Journal of Econometrics, 65 (1): 263--293 (January 1995)Heart of darkness: modeling public–private funding interactions inside the R&D black box, and . Research Policy, 29 (9): 1165--1183 (December 2000)The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools, , and . NBER Work. P., (September 2001)University-Industry Research Partnerships in the United States. (2004)Barriers inhibiting industry from partnering with universities: evidence from the advanced technology program, , and . The Journal of Technology Transfer, 26 (1): 87--98 (2001)The strategic use of patents and its implications for enterprise and competition policies, , , , , , and . Final Report, ENTR/05/82. DG Enterprise, European Commission, (July 2007)The Private Value of Software Patents, and . Research Policy, 39 (7): 994--1009 (September 2010)