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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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Author Info
Hall, Bronwyn H. () (UNU-MERIT)
Mairesse, Jacques () (UNU-MERIT)
Turner, Laure () (ENSAE)

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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 United Nations University, Maastricht Economic and social Research and training centre on Innovation and Technology in its series UNU-MERIT Working Paper Series with number 042.

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Date of creation: 2006
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Handle: RePEc:dgr:unumer:2006042

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Related research
Keywords: scientific productivity age identification panel data bibliometrics.

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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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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  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. 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)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Michael Rauber & Heinrich Ursprung, 2006. "Evaluation of Researchers: A Life Cycle Analysis of German Academic Economists," CESifo Working Paper Series CESifo Working Paper No. , CESifo GmbH. [Downloadable!]
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  2. 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!]
  3. 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!]
  4. 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)
  5. 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!]
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