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st: RE: RE: detect unique values of onevariable into a new variable

From   Nick Cox <>
To   "''" <>
Subject   st: RE: RE: detect unique values of onevariable into a new variable
Date   Tue, 21 Dec 2010 13:08:58 +0000

Note in addition that this question was reviewed by Gary Longton and myself in 

SJ-8-4  dm0042  . . . . . . . . . . . .  Speaking Stata: Distinct observations
        (help distinct if installed)  . . . . . .  N. J. Cox and G. M. Longton
        Q4/08   SJ 8(4):557--568
        shows how to answer questions about distinct observations
        from first principles; provides a convenience command


Nick Cox

This question seems incomplete. 

When you say "unique" I guess you mean "distinct". In your example, only Germany is unique, i.e. occurs once only. 

Do you mean that you want to -drop- duplicates? That is the only way I can think of that answers your question as worded. If so, check out -duplicates-. 

I am assuming that by variable you mean variable in the Stata sense. If you mean something else -- say a macro -- check out -levelsof-. 

Robert Budras

I would like to know if and how I can detect unique values of one
variable and write them into a new variable.

For Example:



I need a variable which is:
unique = "Australia" "Belgium" "Germany"

I don't need:
unique = "Australia" "Australia" "Belgium" "Belgium" "Germany"

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