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

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Author Info
Nicholas J. Cox () (Durham University)

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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.

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File URL: http://fmwww.bc.edu/repec/bocode/l/levels.ado
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File URL: http://fmwww.bc.edu/repec/bocode/l/levels.hlp
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File URL: http://fmwww.bc.edu/repec/bocode/l/levels7.ado
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File URL: http://fmwww.bc.edu/repec/bocode/l/levels7.hlp
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Publisher Info
Software component provided by Boston College Department of Economics in its series Statistical Software Components with number S426303.

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Programming language: Stata
Requires: Stata version 8.0 (7.0 for levels7)
Date of creation: 16 Jul 2002
Date of revision: 08 Apr 2003
Handle: RePEc:boc:bocode:s426303

Note: This module may be installed from within Stata by typing "ssc install levels". Windows users should not attempt to download these files with a web browser.
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Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA
Phone: 617-552-3670
Fax: +1-617-552-2308
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Web page: http://fmwww.bc.edu/EC/
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Related research
Keywords: levels vallist Stata programming values foreach

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This page was last updated on 2008-5-14.

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