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Re: st: RE: Creating repeated index
From
TA Stat <[email protected]>
To
[email protected]
Subject
Re: st: RE: Creating repeated index
Date
Wed, 20 Oct 2010 22:57:38 +0700
It doesn't work. The index should start with "1" for every student.
Pete
On Wed, Oct 20, 2010 at 10:36 PM, Nick Cox <[email protected]> wrote:
> egen index = group(studentid visitdate)
>
> Nick
> [email protected]
>
> Pete
>
> I am trying to create an index/running number based upon same value of
> one variable, i.e., visit date. Different visit date will have
> different index/running number. I can do it by finding duplicates and
> drop them, then create an index and save as a new file, then merge a
> new file with the original one. However, I want to know whether there
> is a short cut to do this. My data will looks like this.
>
> StudentID Visit Date Item Index
> 1 1/1/2010 A 1
> 1 1/1/2010 B 1
> 1 2/4/2010 A 2
> 1 2/4/2010 B 2
> 1 2/4/2010 C 2
> 2 4/1/2010 A 1
> 2 4/1/2010 B 1
> 2 4/1/2010 C 1
> 2 3/3/2010 A 2
> 2 3/3/2010 E 2
>
>
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>
*
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