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st: RE: "unique" with "by"


From   "David Harrison" <david.harrison@icnarc.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: "unique" with "by"
Date   Wed, 19 Apr 2006 16:27:47 +0100

levelsof hhid, local(lev)
foreach h of local lev {
    unique id if hhid==`h' /* make this "`h'" if hhid is string */
}

Hope this helps

David

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Shige Song
Sent: 19 April 2006 15:58
To: statalist@hsphsun2.harvard.edu
Subject: st: "unique" with "by"

Dear Collegues,

I want to get count of unique values of a variable and I want to use it
conjuction with "by" like this:

sort hhid
by hhid: unique id

But unfortunately the UNIQUE command does not allow the use of "by".
Are there other options? Thanks!

Best,
Shige

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