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Issues in Measuring the Degree of Technological Specialization with Patent Data
This paper analyses several issues that arise when measuring technological specialisation with patent data. Three starting choices are required regarding the data source, the statistical measure and the sectoral aggregation level. The authors show that the measure is highly sensitive to the data source and to the level of sectoral aggregation.
Link
http://www.solvay.edu/EN/Research/Bernheim/documents/WP-CEB2005-016_nvz.pdf