Individual Productivity Differences in Public Research : How important are non-individual determinants? An Econometric Study of French Physicists' publications and citations (1986-1997)*

We express grateful thanks to Michele Crance and Serge Bauin of the Unite des Indicateurs de la Politique Scientifique (UNIPS, CNRS), for allowing us access to the data, for their help in compiling the data base and their advices. We thank as well Bronwyn Hall, Richard Blundell, Paul David, Emmanuel Duguet and Frank Windmeijer for their profitable comments and suggestions. We thank Emmanuel Duguet, Bronwyn Hall and Frank Windmeijer for allowing us to use their programs, respectively for the Zero-Inflated Poisson, the Poisson and log-linear estimation on panel data and the non-linear GMM estimation of exponential models. This paper also benefited from discussions at the 10 International Conference on Panel Data in Berlin 2002, at the SPRU Conference “Rethinking Science Policy” and at the Paris Conference in honor of Zvi Griliches 2003. Any remaining error is ours.

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