Error in fix.by(by.x, x) : 'by' must specify a uniquely valid columnmergedata <- merge (dataset1, dataset2, by.x=“personalid”) [closed]

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mergedata <- merge (dataset1, dataset2, by.x="personalid")

Error in fix.by(by.x, x) : 'by' must specify a uniquely valid column

回答1:

The OP had specified only the by.x. If the column names are the same, then by can be used

merge(dataset1, dataset2, by="personalid") 

If the by variable names are different, then we need to specify the by.y as well

merge(dataset1, dataset2, by.x="personalid", by.y = "somethingelse") 

来源：https://stackoverflow.com/questions/49954874/error-in-fix-byby-x-x-by-must-specify-a-uniquely-valid-columnmergedata