心之所往2007 2021-05-17 23:24 开发者_如何学编程 猪连铁是方言,正确的为猪横脷,是猪的脾脏,窄而长,色深红,其横切面呈三角形,壁面扁平,脏面形成一长嵴,嵴上有脾门并附有一些结缔组织和脂肪。
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