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RE: st: RE: how to -expand- and attach new group id to panel data
From
"sdm1" <[email protected]>
To
<[email protected]>
Subject
RE: st: RE: how to -expand- and attach new group id to panel data
Date
Fri, 1 Oct 2010 11:20:38 +0100
Thanks Austin.
Steve
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Austin Nichols
Sent: 30 September 2010 20:14
To: [email protected]
Subject: Re: st: RE: how to -expand- and attach new group id to panel data
bys group_id year: g clone=_n
egen newid=group(group_id clone)
On Thu, Sep 30, 2010 at 12:57 PM, Nick Cox <[email protected]> wrote:
> Two answers:
>
> 1. Why and how are you discriminating between clones of any panel?
>
> 2. -egen, seq()-.
>
> Nick
> [email protected]
>
> Steve
>
> I have a balanced panel data set with 3 annual observations for each of 3
> groups e.g.,
>
> Group_id year
> 1 78
> 1 79
> 1 80
> 2 78
> 2 79
> 2 80
> 3 78
> 3 79
> 3 80
>
> Suppose I use -expand- to generate, say, one extra copy of the data for
> group_id 2 and two extra copies of the data for group_id 3. Now I have:
>
> Group_id year
> 1 78
> 1 79
> 1 80
> 2 78
> 2 79
> 2 80
> 3 78
> 3 79
> 3 80
> 2 78
> 2 79
> 2 80
> 3 78
> 3 79
> 3 80
> 3 78
> 3 79
> 3 80
>
> How do I give new group_ids to the copied data so that now:
>
> Group_id year Newgroup_id
> 1 78 1
> 1 79 1
> 1 80 1
> 2 78 2
> 2 79 2
> 2 80 2
> 3 78 3
> 3 79 3
> 3 80 3
> 2 78 4
> 2 79 4
> 2 80 4
> 3 78 5
> 3 79 5
> 3 80 5
> 3 78 6
> 3 79 6
> 3 80 6
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