UNIQUE: Stata module to report number of unique values in variable(s)

Tony Brady ()
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Tony Brady: Royal Postgraduate Medical School

Statistical Software Components from Boston College Department of Economics

Abstract: The command unique without a by reports the number of unique values for the varlist. With a by it does the same, but also creates a new variable (_Unique by default but can be named in the gen option). This new variable contains the number of unique values of the varlist for each level of the by variable. The new variable is coded missing except for the first record in each group defined by the levels of the by variable. The command is useful for exploring data where the records refer to more than one level, for example longitudinal data where each record refers to a visit by a subject.

Language: Stata
Date: 1998-09-04

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/u/unique.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/unique.hlp help file (text/plain)

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Persistent link: http://EconPapers.repec.org/RePEc:boc:bocode:s354201

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