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张宁、杜克锐：《效率与生产率分析教程——理论、应用与编程》相关程序代码和数据

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Malmquist Productivity index in Stata

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一大堆网络数据获取、绘图的Stata命令集成包

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连玉君的 plus 文件夹，存放了数百个外部命令。