M34****915 开发者_运维知识库 2021-05-17 17:42 陆星辰是谁
I\'m pretty new to Stata. I have a set of observation开发者_运维技巧s of the form \"CountryGDPYear\". I want to create a new variable GDP1960, which gives the GDP in 1960 of each country for each yea
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