Selection bias in innovation studies: A simple test
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. Â© 2013 Elsevier Inc.
- URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-84888066331&partnerID=40&md5=4ad75e7277eaeeb00968a7caa5c469e8
Keywords: Belgium ; data set ; econometrics ; estimation method ; Germany ; innovation ; Innovation studies ; Knowledge production function ; Patent count ; Patents and inventions ; Production function ; R&D ; research and development ; Selection bias ; Simple tests ; Societies and institutions
Record created on 2015-02-24, modified on 2016-08-09