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Selection Bias in Innovation Studies. A Simple Test

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Author Info

  • Gaétan de Rassenfosse

    ()
    (Melbourne Institute of Applied Economic and Social Research, The University of Melbourne; Intellectual Property Research Institute of Australia, The University of Melbourne)

  • Anja Schoen

    (Technische Universität München)

  • Annelies Wastyn

    (Department of Managerial Economics, Strategy and Innovation, KU Leuven)

Abstract

The study of the innovative output of organizations often relies on a count of patents filed at one single office of reference such as the European Patent Office (EPO). Yet, not all organizations file their patents at the EPO, raising the specter of a selection bias. Using novel datasets of the whole population of patents by Belgian firms and German universities, we show that the single-office count results in a selection bias that affects econometric estimates of invention production functions. We propose a methodology to evaluate whether estimates that rely on the single-office count are affected by a selection bias.

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Bibliographic Info

Paper provided by Melbourne Institute of Applied Economic and Social Research, The University of Melbourne in its series Melbourne Institute Working Paper Series with number wp2013n08.

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Length: 42 pages
Date of creation: Mar 2013
Date of revision:
Handle: RePEc:iae:iaewps:wp2013n08

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Keywords: Knowledge production function; patent count; R&D; selection bias;

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References

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  1. Zvi Griliches, 1991. "Patent Statistics as Economic Indicators: A Survey," NBER Working Papers 3301, National Bureau of Economic Research, Inc.
  2. Dirk Czarnitzki & Bernd Ebersberger & Andreas Fier, 2007. "The relationship between R&D collaboration, subsidies and R&D performance: Empirical evidence from Finland and Germany," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 22(7), pages 1347-1366.
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  4. Heckman, James J, 1979. "Sample Selection Bias as a Specification Error," Econometrica, Econometric Society, vol. 47(1), pages 153-61, January.
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  7. de Rassenfosse, Gaetan & van Pottelsberghe de la Potterie, Bruno, 2009. "A policy insight into the R&D-patent relationship," Research Policy, Elsevier, vol. 38(5), pages 779-792, June.
  8. Blundell, Richard & Griffith, Rachel & van Reenen, John, 1999. "Market Share, Market Value and Innovation in a Panel of British Manufacturing Firms," Review of Economic Studies, Wiley Blackwell, vol. 66(3), pages 529-54, July.
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  13. van Pottelsberghe, Bruno & van Zeebroeck, Nicolas, 2008. "Filing Strategies and Patent Value," CEPR Discussion Papers 6821, C.E.P.R. Discussion Papers.
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  20. Richard Gilbert, 2006. "Looking for Mr. Schumpeter: Where Are We in the Competition-Innovation Debate?," NBER Chapters, in: Innovation Policy and the Economy, Volume 6, pages 159-215 National Bureau of Economic Research, Inc.
  21. Leslie E. Papke & Jeffrey M. Wooldridge, 1993. "Econometric Methods for Fractional Response Variables with an Application to 401(k) Plan Participation Rates," NBER Technical Working Papers 0147, National Bureau of Economic Research, Inc.
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  23. Cincera, Michele, 1997. "Patents, R&D, and Technological Spillovers at the Firm Level: Some Evidence from Econometric Count Models for Panel Data," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 12(3), pages 265-80, May-June.
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Cited by:
  1. Jérôme Danguy & Gaétan de Rassenfosse & Bruno van Pottelsberghe de la Potterie, 2013. "On the Origins of the Worldwide Surge in Patenting: An Industry Perspective on the R&D-Patent Relationship," Melbourne Institute Working Paper Series wp2013n15, Melbourne Institute of Applied Economic and Social Research, The University of Melbourne.
  2. Gaétan de Rassenfosse & Hélène Dernis & Dominique Guellec & Lucio Picci & Bruno van Pottelsberghe de la Potterie, 2012. "The Worldwide Count of Priority Patents: A New Indicator of Inventive Activity," Melbourne Institute Working Paper Series wp2012n23, Melbourne Institute of Applied Economic and Social Research, The University of Melbourne.

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