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st: AW: Keep subsequent observations in panel data


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: Keep subsequent observations in panel data
Date   Mon, 5 Oct 2009 16:33:43 +0200

<> 



What do " i   t   y" stand for?



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] Im Auftrag von Nikolaos Kanellopoulos
Gesendet: Montag, 5. Oktober 2009 16:28
An: [email protected]
Betreff: st: Keep subsequent observations in panel data

Dear all,

I have a very simple unbalanced panel, where individuals are allowed to drop in and out of the sample. I want to create two separate datasets with  the following sampling criteria.

For the first one, individuals  that appear in the first wave should remain in the sample at subsequent years until the first time they drop out of the panel,
either completely or not. If they rejoin the panel later these observations should not be used. For instance in the following example I want to keep only observations 129 and 130.

+----------------------+
i   t   y 
----------------------
129.  1      1     0 
130.  1      2     0 
133.  1      5     0 
134.  1      6     0 
135.  1      7     0 
136.  1      8     0 
+----------------------+
137.  2      2     0 
138.  2      5     0 
139.  2      6     0 
140.  2      7     0 
141.  2      8     0 
+----------------------+

For the second dataset individuals should remain in the sample at subsequent years from the first time they are observed until the first time they drop out of the panel, either completely or return again. Again , if they rejoin the panel later these observations should not be used. For instance in the following example I want to keep only observations 129 to 130 and 137.

+----------------------+
i   t   y 
----------------------
129.  1      1     0 
130.  1      2     0 
133.  1      5     0 
134.  1      6     0 
135.  1      7     0 
136.  1      8     0 
+----------------------+
137.  2      2     0 
138.  2      5     0 
139.  2      6     0 
140.  2      7     0 
141.  2      8     0 
+----------------------+


Thanks 
Nikos



      
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