ufo198010 2021-05-17 13:47 家常海鲶鱼做法食材主料海鲶鱼1000g土豆1个辅料油适量盐适量酱油适量味精适量大葱适量葱适量姜适量大蒜适量干辣椒适量料酒适量步骤1.海鲶鱼去内在土豆去皮2.葱姜蒜辣椒切碎3.土豆奔
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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