//分类汇总//stata中collapse的用法////stata中的collapse命令是一种重新整理数据的有效工具，它可以将多个变量和水平的多维数据表合并成一个维度的数据表。它的语法格式如下:////collapse[varlist][,by(varlist)][ifexp][weight][usingfilename]////其中，va

*rencode*Programtoencodevariableandreplaceoriginalasdesired.*Likeencode,butcanspecifyreplaceoptioninsteadofgenerate(name).*Thisprogramalsocompressesthegeneratedvariabletoamoreefficientdatatypeifpossible.*KennethL.S

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sysuseauto,clearlevelsofforeign,local(levels)foreachxoflocallevels{diinyellow"`x'isauniquevalueofrep78"}//遍历各个变量的标签及变量值sysuseauto.dta,clearlocalk=_Nforeachvarofvarlist_all{locala:varlabel`var'