TY  - JOUR
AU  - Hall,Bronwyn H.
AU  - Mairesse,Jacques
AU  - Turner,Laure
TI  - Identifying Age, Cohort and Period Effects in Scientific Research Productivity: Discussion and Illustration Using Simulated and Actual Data on French Physicists
JF  - National Bureau of Economic Research Working Paper Series
VL  - No. 11739
PY  - 2005
Y2  - November 2005
UR  - http://www.nber.org/papers/w11739
L1  - http://www.nber.org/papers/w11739.pdf
N1  - Author contact info:
Bronwyn H. Hall
Dept. of Economics
549 Evans Hall
UC Berkeley
Berkeley, CA 94720-3880
Tel: 510/642-3878
Fax: 510/548-5561
E-Mail: bhhall@nber.org

Jacques Mairesse
CREST-INSEE
15, Boulevard Gabriel PERI
92245 MALAKOFF CEDEX
FRANCE
Tel: 33-1-41-17-35-50
Fax: 33-1-41-17-76-34
E-Mail: mairesse@ensae.fr

Laure Turner
CREST - Labratoire d'Economie Industrielle
28 rue des Saints-Pere
75007 Paris
France
E-Mail: laure.turner@ensae.fr
AB  - 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.
ER  -