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Identifying Age, Cohort and Period Effects in Scientific Research Productivity: Discussion and Illustration Using Simulated and Actual Data on French Physicists

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Bronwyn H. Hall
Jacques Mairesse
Laure Turner

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Abstract

The identification of age, cohort (vintage), and period (year) effects in a panel of individuals or other units is an old problem in the social sciences, but one that has not been much studied in the context of measuring researcher productivity. In the context of a semi-parametric model of productivity where these effects are assumed to enter in an additive manner, we present the conditions necessary to identify and test for the presence of the three effects. In particular we show that failure to specify precisely the conditions under which such a model is identified can lead to misleading conclusions about the productivity-age relationship. We illustrate our methods using data on the publications 1986-1997 by 465 French condensed matter physicists who were born between 1936 and 1960.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 11739.

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Date of creation: Nov 2005
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Handle: RePEc:nbr:nberwo:11739

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Find related papers by JEL classification:
C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data
O31 - Economic Development, Technological Change, and Growth - - Technological Change - - - Innovation and Invention: Processes and Incentives
J44 - Labor and Demographic Economics - - Particular Labor Markets - - - Professional Labor Markets and Occupations

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  1. Ernst R. Berndt & Zvi Griliches & Neal Rappaport, 1995. "Econometric Estimates of Prices Indexes for Personal Computers in the 1990s," NBER Working Papers 4549, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  2. Ashish Arora & Paul David & Alfonso Gambardella, 1998. "Reputation and Competence in Publicly Funded Science: Estimating the Effects on Research Group Productivity," Annales d'Economie et de Statistique, ADRES, issue 49-50, pages 07, Janvier-J. [Downloadable!]
  3. Levin, Sharon G & Stephan, Paula E, 1991. "Research Productivity over the Life Cycle: Evidence for Academic Scientists," American Economic Review, American Economic Association, vol. 81(1), pages 114-32, March. [Downloadable!] (restricted)
  4. Blundell, Richard & Griffith, Rachel & Windmeijer, Frank, 2002. "Individual effects and dynamics in count data models," Journal of Econometrics, Elsevier, vol. 108(1), pages 113-131, May. [Downloadable!] (restricted)
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  5. Ashish Arora & Alfonso Gambardella, 1996. "Reputation and competence in publicly funded scientific research," Industrial Organization 9605002, EconWPA. [Downloadable!]
  6. Caroline Lanciano-morandat & Hiroatsu Nohara, 2003. "The New Production of Young Scientists (PhDs) A Labour Market Analysis in International Perspective," DRUID Working Papers 03-04, DRUID, Copenhagen Business School, Department of Industrial Economics and Strategy/Aalborg University, Department of Business Studies. [Downloadable!]
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  1. Toole, Andrew A. & Czarnitzki, Dirk, 2007. "Life Scientist Mobility from Academe to Industry: Does Academic Entrepreneurship Induce a Costly ?Brain Drain? on the Not-for-Profit Research Sector?," ZEW Discussion Papers 07-072, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research. [Downloadable!]
  2. Kenneth S. Corts & Mara Lederman, 2007. "Software Exclusivity and the Scope of Indirect Network Effects in the U.S. Home Video Game Market," Working Papers 07-43, NET Institute, revised Nov 2007. [Downloadable!]
  3. Michael Rauber & Heinrich Ursprung, 2006. "Evaluation of researchers : a life cycle analysis of German academic economists," Working Papers of the Research Group Heterogenous Labor 06-08, Research Group Heterogeneous Labor, University of Konstanz/ZEW Mannheim. [Downloadable!]
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  4. Aditi Mehta & Marc Rysman & Tim Simcoe, 2007. "Identifying the Age Profile of Patent Citations," Boston University - Department of Economics - Working Papers Series WP2007-021, Boston University - Department of Economics. [Downloadable!]
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  5. Jeffrey L. Furman & Scott Stern, 2006. "Climbing Atop the Shoulders of Giants: The Impact of Institutions on Cumulative Research," NBER Working Papers 12523, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  6. Claudia R. Sahm, 2007. "Stability of risk preference," Finance and Economics Discussion Series 2007-66, Board of Governors of the Federal Reserve System (U.S.). [Downloadable!]
  7. Josh Lerner & Morten Sørensen & Per Strömberg, 2008. "Private Equity and Long-Run Investment: The Case of Innovation," NBER Working Papers 14623, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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