Selection bias in innovation studies: A simple test.

Autor:	de Rassenfosse, Gaétan, Schoen, Anja, Wastyn, Annelies
Předmět:	TECHNOLOGICAL innovations DATA analysis UNIVERSITIES & colleges ECONOMETRICS ESTIMATION theory
Zdroj:	Technological Forecasting & Social Change; Jan2014, Vol. 81, p287-299, 13p
Abstrakt:	Abstract: The study of the innovative output of organizations often relies on a count of patents filed at one single office of reference such as the European Patent Office (EPO). Yet, not all organizations file their patents at the EPO, raising the specter of a selection bias. Using novel datasets of the whole population of patents by Belgian firms and German universities, we show that the single-office count results in a selection bias that affects econometric estimates of invention production functions. We propose an easy-to-implement methodology to evaluate whether estimates that rely on the single-office count are affected by a selection bias. [Copyright &y& Elsevier]
Databáze:	Supplemental Index
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