How to echo error from foreach loop?

Easy Question -- I want to join multiple datasets to my master dataset using foreach loop. Error comes up saying unmatched is not a valid option (syntax error).  If I get rid of the unmatched option, the code runs, but the inner join drops data I need.  How do I run a left outer join loop in STATA?

  • Joinby and Foreach command

  • Answer:

    What is the current command loop that you are running? It would be helpful to see that in order to answer your question.

Krishanu Karmakar at Quora Visit the source

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Other answers

There's no specific command to support the conception "left outer join" in stata, datasets are jioned by "merge". So if you're using merge to join datasets, maybe you can make it out by two step: 1, join all datasets using merge 1:n(because I don't know the relation of correspondence of your data, using 1:n migt be a universal choice);2, after that, drop all entries if _merge = 2.

Bo. Wu

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