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Re: st: Balanced panel


From   Estrella Gomez <[email protected]>
To   [email protected]
Subject   Re: st: Balanced panel
Date   Thu, 11 Jul 2013 16:09:49 +0200

Perfect! Thanks a lot
Estrella

2013/7/11 Nick Cox <[email protected]>:
> Check out -fillin-.
>
> [D]     fillin  . . . . . . . . . . . . . . . . . . . . Rectangularize dataset
>         (help fillin)
>
> SJ-5-1  dm0011  . . . . . . . . . . . . . .  Stata tip 17: Filling in the gaps
>         . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>         Q1/05   SJ 5(1):135--136                                 (no commands)
>         tips for using fillin to fill in gaps in a rectangular
>         data structure
> Nick
> [email protected]
>
>
> On 11 July 2013 14:47, Estrella Gomez <[email protected]> wrote:
>> Dear statalisters
>>
>> I have a panel that contains exporters, importers and years. Since
>> some countries do not trade at all, I would like to generate the zero
>> observations for those cases. The command tsfill, full allows me to do
>> it for a pair of countries that traded in a given year, but no in the
>> rest. It generates zero observations for the years in which two
>> countries did not trade, given that those countries traded in some
>> year of the sample.
>>
>> However, I would also like to generate zero flows if two countries did
>> not trade at all in any year. For instance, in the following case:
>>
>> t       exporter        importer        trade
>> 2006    AR      CA      1
>> 2008    AR      CA      1
>> 2006    US      CA      1
>> 2007    US      CA      1
>> 2008    US      CA      1
>> 2006    US      AR      1
>> 2007    US      AR      1
>> 2008    US      AR      1
>> 2006    CA      US      1
>> 2007    CA      US      1
>> 2008    CA      US      1
>> 2006    AT      US      1
>> 2007    AT      US      1
>> 2008    AT      US      1
>>
>> tsfill, full would generate:
>>
>> t       exporter        importer        trade
>> 2007    AR      CA      .
>>
>> but I would also need
>>
>> t       exporter        importer        trade
>> 2006    AR      AT      .
>> 2007    AR      AT      .
>> 2008    AR      AT      .
>>
>>
>> Any idea?
>> Thank you very much,
>> Estrella
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