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Subtitle: bias and precision in patent-based measures of technological proximity
By: Mary Benner, Joel Waldfogel.
Contributors: Waldfogel, Joel, 1962-; National Bureau of Economic Research.
Series: NBER working paper series -- working paper 13322.; Working paper series (National Bureau of Economic Research) -- working paper no. 13322.
Publisher: National Bureau of Economic Research
Published: 2007
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 37
Subjects: Patents -- Mathematical models -- Evaluation; Technological innovations -- Mathematical models
Notes: "August 2007."

Includes bibliographical references (p. 24-25).

Also available in PDF from the NBER World Wide Web site (www.nber.org).