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LEVELS: Stata module to report distinct levels of integer or string variable

Author

Listed:
  • Nicholas J. Cox

    (Durham University)

Programming Language

Stata

Abstract

levels displays a sorted list of the distinct values of varname, which should be a variable taking on integer or string values, or in other words, a categorical variable, very broadly so defined. It may be useful when it is desired to cycle through the distinct values of varname with (say) foreach. levels leaves behind a list in r(levels) which may be used in a subsequent command. Optionally, the list may be inserted as a local macro within the calling program's space. levels is considered to be vallist (STB-60) done better. levels requires Stata 8. levels7, also herewith, is a version for Stata 7.

Suggested Citation

  • Nicholas J. Cox, 2002. "LEVELS: Stata module to report distinct levels of integer or string variable," Statistical Software Components S426303, Boston College Department of Economics, revised 08 Apr 2003.
    • Handle: RePEc:boc:bocode:s426303
    Note: This module may be installed from within Stata by typing "ssc install levels". 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/l/levels.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/l/levels.hlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/l/levels7.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/l/levels7.hlp
    File Function: help file
    Download Restriction: no
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