Stata学习：如何构建美国发明者申请数变量？

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文献来源 Number of patents (Palomeras and Melero, 2010). Palomeras, N., Melero, E. (2010).Markets for Inventors: Learning-by-Hiring as a Driver of Mobility. Management Science, 56(5), 881–895. 数据来源 清洗数据 u id_appyear , clear merge 1 : 1 id using id_inventor_id , nogen bys inv a : egen NumPat = count ( a ) drop id duplicates drop la var N 美国发明者申请数 sa 美国发明者申请数 , replace d su 得到结果 Contains data from 美国发明者申请数.dta Observations: 3,828,913 Variables: 3 8 Apr 2024 11:12 ------------------------------------------------------------------------------------ Variable Storage Display Value name type format label Variable label ------------------------------------------------------------------------------------ appyear int %10.0g inventor_id str ………………………………