In addition, new evidence emerges on the effect of researchers administrative tasks-which seem to be negatively related with researcher’s productivity-and on the composition of departments. The empirical evidence on the connection between teaching and research activities suggests that no univocal substitution or complementarity thesis can be claimed: a major teaching load does not affect the odds to be a non-active researcher and does not significantly reduce the number of publications for active researchers. Analogously, the analysis confirms that productivity is strongly affected by the publication and citation practices adopted in different scientific disciplines. As to the personal observable characteristics of the researchers, the results emphasize the age effect and the gender productivity gap-as previously documented by existing studies. In this setting, the goodness-of-fit of several Poisson mixture regression models are explored by assuming an extensive set of explanatory variables. The corresponding distributions are highly skewed and display an excess of zero-valued observations. Three different indicators-based on the number of publications and/or citations-are considered as response variables. The dataset includes 942 permanent researchers of various scientific sectors for a 3-year time-span (2008–2010). An original cross-sectional dataset referring to a medium-sized Italian university is implemented in order to analyze the determinants of scientific research production at individual level.
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