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The PI for this project is Iain Cockburn. SMSAs), and a codification of inventor names. These are anticipated to include "link-out" tables connecting patent numbers to geographic entities (e.g. A variety of additional fields and indexes will also be provided. A new release of these files, bringing existing data up to date through December 2004, is anticipated for 2010 or 2011. The NBER is working on a major NSF-funded update and extension of this data.
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The CUSIP match is based on the 1989 universe of companies "The NBER Patent Citation Data File: Lessons, Insights and Methodological Tools." NBER Working Paper 8498.ĪLL USERS OF THESE DATA SHOULD READ THIS PAPER, AND SHOULD CITE IT AS THE SOURCE OF THE DATAįurther documentation on uses of the patent citation data, including the methodology paper and a CD containing the complete dataset itself, is available in the book Patents, Citations and Innovations: A Window on the Knowledge Economy by Adam Jaffe and Manuel Trajtenberg, MIT Press, Cambridge (2002). Transportation Economics in the 21st Century.Training Program in Aging and Health Economics.The Roybal Center for Behavior Change in Health.Retirement and Disability Research Center.Measuring the Clinical and Economic Outcomes Associated with Delivery Systems.Improving Health Outcomes for an Aging Population.Conference on Research in Income and Wealth.Conference on Econometrics and Mathematical Economics.Productivity, Innovation, and Entrepreneurship.International Finance and Macroeconomics.The second picture is the picture of the table, there is no value of DateSAS variable. Proc contents data=stock.performanceclean
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Keep ticker Company_Name EventDate Date DateSAS Returns ReturnsF MrkReturn
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Where Returns is not missing and Returns ne "B" format to data format? Thank you so much! Would you please show me another way to correct my code so that I can change the numeric BEST. format to DataSAS but there is no value recorded for this variable in the data table. I wrote a code to change the format to the new variable named DateSAS with date9. It seems to me that it's supposed to be "BEST12.". I used proc content and realized that "Date" variable is Numeric with "BEST." format. I imported an excel file to SAS data file with proc import. format to find the answer before posting this topic.
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