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st: RE: RE: how to -expand- and attach new group id to panel data


From   "sdm1" <sdm1@york.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: how to -expand- and attach new group id to panel data
Date   Fri, 1 Oct 2010 11:19:00 +0100

Thanks Nick.  

I want to use -xtivreg, re- but to give more weight to some groups.  As
there is no weight facility with -xtivreg, re- I thought of -expand-ing the
groups in lieu of weighting, and then running -xtivreg, re-.  I appreciate
that the standard errors will be meaningless but it is the coefficients that
I am most interested in.

Steve 

 
-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: 30 September 2010 17:58
To: 'statalist@hsphsun2.harvard.edu'
Subject: st: RE: how to -expand- and attach new group id to panel data

Two answers: 

1. Why and how are you discriminating between clones of any panel? 

2. -egen, seq()-. 

Nick 
n.j.cox@durham.ac.uk 

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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