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FIRSTDIGIT: Stata module to analyse first digits of numeric variables


  • Nicholas J. Cox

    () (Durham University)


firstdigit tabulates and analyses the first digits of numeric variables. It also tests Benford's law that digits d = 1,..,9 occur with probabilities log10(1 + 1/d). Thus given data of 12, 345, 6789, etc., it would extract 1, 3, 6, etc., tabulate the frequencies of the digits 1 to 9 and give a chi-square test of the law.

Suggested Citation

  • Nicholas J. Cox, 2007. "FIRSTDIGIT: Stata module to analyse first digits of numeric variables," Statistical Software Components S456842, Boston College Department of Economics, revised 27 May 2007.
  • Handle: RePEc:boc:bocode:s456842
    Note: This module should be installed from within Stata by typing "ssc install firstdigit". The module is made available under terms of the GPL v3 ( Windows users should not attempt to download these files with a web browser.

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    More about this item


    digits; Benford's Law; fraud; data cleaning;


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