有没有办法用R&39；的Merge()创建Stata_Merge指标变量？ [英] Is there a way to create Stata's _merge indicator variable with R's merge()?

问题描述

Stata自动创建一个名为"_merge"的变量，表示合并后两个数据集中匹配的变量。有没有办法获得由R的Merge()函数生成的此类变量？

推荐答案

_merge中_merge的可能值为(注意merge也可以有值4和5)

              1       master             observation appeared in master only
              2       using              observation appeared in using only
              3       match              observation appeared in both

在R中，您可以通过将参数输入为all=TRUE、all.x=TRUE或all.y=TRUE

来完成此操作

例如

merge(x, y, by = intersect(names(x), names(y)),by.x = by, by.y = by, all = TRUE)
 merge(x, y, by = intersect(names(x), names(y)),by.x = by, by.y = by, all.x = TRUE)
 merge(x, y, by = intersect(names(x), names(y)),by.x = by, by.y = by, all.y = TRUE)

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