Stata学习：如何构建企业蜕变变量？

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前情回顾 数据来源 清洗数据 cd C : \ Download u fs_comins_2023_annual_consolidate_2023 , clear keep Stkcd year B001209000 B001210000 merge 1 : 1 S y using PT_LCRDSPENDING_2023_year , nogen keepus ( RDSpendSum ) merge 1 : 1 S y using fs_combas_2023_annual_consolidate_2023 , nogen keepus ( A001000000 ) egen r = rowtotal ( R ) drop R egen i = rowtotal ( B001209000 B001210000 ) g R = r / A g I = i / A xtset S y g s = R / I - L . R / L . I forv i = 0 / 2 { g L ` i 's = L`i' . s } egen m = rowmean ( L * s ) winsor m , p ( . 01 ) g ( Metamo ) keep S y M drop if mi ( M ) | M == 0 la var M 企业蜕变 sa 企业蜕变 , replace d ta y kdensity M 得到结果 Contains data from 企业蜕变.dta Observations: 39,024 Variables: 3 24 Jun 2024 12: ………………………………