Stata学习：如何构建美国发明者网络规模变量？

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前情回顾 数据来源 清洗数据 cd C : \ Download u id_inventor_id , clear merge 1 : 1 id using id_patent_num , nogen merge 1 : 1 id using id_appyear , nogen drop id sa _ , replace * u _ , clear su a , d loc m = r ( min ) loc n = r ( max ) forv i = ` m '/`n' { u _ , clear keep if inrange ( a , ` i '-2,`i' ) drop a duplicates drop g year = ` i ' sa _ ` i ', replace } * u _ , clear su a , d loc m = r ( min ) loc n = r ( max ) forv i = ` m '/`n' { u _ ` i ', clear ren i z drop y joinby p using _ ` i ' drop if i == z keep i z duplicates drop g year = ` i ' sa _ ` i '_iz, replace g n = 0 collapse ( count ) n , by ( i ) g year = ` i ' sa _ ` i '_, replace } * u _ , clear su a , d loc m = r ( min ) loc n = r ( ………………………………