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DUPS: Stata module to identify and optionally remove duplicate observations

Listed author(s):
  • Nicholas J. Cox


    (University of Durham)

  • Thomas Steichen


dups provides information about unique and duplicate observations in the dataset and, optionally, drops all duplicate observations. varlist is an optional variable list that determines which observations are duplicates (observations must match exactly on all variables in the list to be duplicates). If no varlist is given, then all variables in the dataset are used to determine duplicates. drop is a command line option that causes duplicate observations to be dropped from the dataset. Both terse and verbose options are available to modify the detail in the default output; terse gives bare minimum information; verbose lists detailed information about duplicate observations. This is version 1.0.3 of the software.

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Software component provided by Boston College Department of Economics in its series Statistical Software Components with number S322901.

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Programming language: Stata
Requires: Stata version 6
Date of creation: 15 Oct 1997
Date of revision: 23 Sep 2001
Handle: RePEc:boc:bocode:s322901
Note: This module may be installed from within Stata by typing "ssc install dups". Windows users should not attempt to download these files with a web browser.
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Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA

Phone: 617-552-3670
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