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  • Detecting inverted duplicates over two columns

    Hello, I have searched for an answer to this simple question on previous forums, and cannot find the specific situation I am hoping to rectify.

    I am looking to detect duplicates, but they will be found inverted over two columns, so it is not the typical "duplicate" usually referred to in Stata. As an example:

    Obs Var1 Var2
    1 A B
    2 B A
    3 A C
    4 C A

    (This is a simplification of the content of the cells.)

    I need Stata to let me know when 2 and 4 occur, because I need to delete them. They are in String format. I have tried identifying them with loops over levelsof locals but I cannot seem to get the right identification of repeated content).

    Thank you.


  • #2
    I have found a response by Nick Cox here, https://journals.sagepub.com/doi/pdf...867X0800800414. Thank you Nick.

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