Stata学习：如何构建美国发明者企业核心变量？

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文献来源 Core inventor is a binary variable measuring whether an inventor has patented in the firm’s core technology (most frequent patent class observed in incumbent firm) in the observation year. Scoresby, R. B., Park, H. (2021).The joint effects of individual and firm level knowledge attributes on inventor mobility to entrepreneurial and established firms. Journal of Business Research, 133, 218–230. 数据来源 清洗数据 cd C : \ Download u id_inventor_id , clear merge 1 : 1 id using id_ipc_class , nogen merge 1 : 1 id using id_appyear , nogen g j = substr ( ip , 1 , 1 ) sa _1 , replace * u _1 , clear su a , d loc m = r ( min ) loc n = r ( max ) forv i = ` m '/`n' { u _1 , clear keep if a = ` i ' keep inv j duplicates drop g year = ` i ' sa _ ` i ', replace } clear forv i = ` m '/`n' { ap using _ ` i ' } g A = 1 compres ………………………………