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

Nicholas Cox

Statistical Software Components from Boston College Department of Economics

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.

Language: Stata
Requires: Stata version 8.0 (7.0 for levels7)
Keywords: levels; vallist; Stata programming; values; foreach (search for similar items in EconPapers)
Date: 2002-07-16, Revised 2003-04-08
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.
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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/l/levels.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/l/levels.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/l/levels7.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/l/levels7.hlp help file (text/plain)

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