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

Hall, Bronwyn, Mairesse, Jacques and Turner, Laure (2006). Identifying Age, Cohort and Period Effects in Scientific Research Productivity - Discussion and Illustration Using Simulated and Actual Data on French Physicists. UNU-MERIT.

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  • Author Hall, Bronwyn
    Mairesse, Jacques
    Turner, Laure
    Title Identifying Age, Cohort and Period Effects in Scientific Research Productivity - Discussion and Illustration Using Simulated and Actual Data on French Physicists
    Publication Date 2006
    Publisher UNU-MERIT
    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.
    Keyword Scientific productivity
    Age
    Identification
    Panel data
    Bibliometrics
    JEL C23
    O31
    J44
    Copyright Holder UNU-MERIT
    Copyright Year 2006
    ISSN 1871-9872
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    Created: Wed, 11 Dec 2013, 15:48:44 JST