Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/56018
Authors: 
De Rassenfosse, Gaétan
Wastyn, Annelies
Year of Publication: 
2012
Series/Report no.: 
ZEW Discussion Papers 12-012
Abstract: 
The study of the innovative output of firms often relies on a count of patents filed at one single office of reference such as the European Patent Office (EPO). Yet, not all firms file their patents at the EPO, raising the specter of a selection bias. Using a novel dataset of the whole population of patents by Belgian firms, we show that the single-office count results in a selection bias that affects econometric estimates of innovation production functions. We propose a methodology to evaluate whether estimates that rely on the single-office count are affected by a selection bias.
Subjects: 
Innovation production function
patent
R&D
selection bias
JEL: 
O31
C18
C52
C81
Document Type: 
Working Paper

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