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DUPS: Stata module to identify and optionally remove duplicate observations

Author

Listed:
  • Nicholas J. Cox

    (University of Durham)

  • Thomas Steichen

Programming Language

Stata

Abstract

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.

Suggested Citation

  • Nicholas J. Cox & Thomas Steichen, 1997. "DUPS: Stata module to identify and optionally remove duplicate observations," Statistical Software Components S322901, Boston College Department of Economics, revised 23 Sep 2001.
    • Handle: RePEc:boc:bocode:s322901
    Note: This module may be installed from within Stata by typing "ssc install dups". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
    as

    Download full text from publisher

    File URL: http://fmwww.bc.edu/repec/bocode/d/dups.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/d/dups.hlp
    File Function: help file
    Download Restriction: no
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