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st: scripting question (_n)


From   "kelly johnson" <econometrics@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: scripting question (_n)
Date   Fri, 26 Aug 2005 11:43:48 -0400

Hi,

I have a variable (var1) like this:

var1
a
a
a
a
a
b
a
a
a
b
a
... (there are several thousand of these)

I want to creat a unique number to identify each set from a-b. e.g.:
var1 var2
a 1
a 1
a 1
a 1
a 1
b 1
a 2
a 2
a 2
b 2
a3
...
I know how to use the _n command, but am unsure of how to employ it in this case (i can do it in the opposite order). any help would be appreciated.

kelly

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