Detect duplicate observations in a data set in Stata

You can check for duplicate observations in Stata in the following ways:

  • The isid command can detect duplicate observations:
      . isid x1 x2 x3
  • The duplicates command can list and flag duplicate observations. The list subcommand lists the duplicate observations:
      . duplicates list x1 x2 x3
  • The tag subcommand and the generate() option flag duplicate observations by assigning 1 to duplicacy in the variable duple:
      . duplicates tag x1 x2 x3, generate(duple)

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This is document aqea in the Knowledge Base.
Last modified on 2019-02-11 16:50:20.

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