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Re: st: Generating (simple) spatial variables (excluding the country of observation)


From   Waedlich Felix <fwaedlich@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Generating (simple) spatial variables (excluding the country of observation)
Date   Fri, 25 Feb 2011 08:48:16 +0100

Dear Nick and Fernando,

thanks a lot. Ur suggestions worked perfectly (as always).
 
Best
Felix
Am 24.02.2011 um 02:46 schrieb Nick Cox:

> Here is a recipe:
> 
> Total of others = Total of all - Total (value) of this one
> 
> Mean of others = Total of others / (Count of all - 1)
> 
> The argument is expanded in excruciating detail within an FAQ:
> 
> FAQ     . . Creating variables recording prop. of the other members of a group
>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>        4/05    How do I create variables summarizing for each
>                individual properties of the other members of a
>                group?
>                http://www.stata.com/support/faqs/data/members.html
> 
> In your case, this looks like (allowing for the possibility of an
> unbalanced panel)
> 
> bysort year: gen nothers = _N - 1
> bysort year : egen total = total(capital)
> gen meanothers = (total - capital)  / nothers
> 
> The first line assumes no missings on -capital-. If there are missings
> of capital, you need
> 
> bysort year : egen n = count(capital)
> bysort year : egen total = total(capital)
> gen meanothers = (total - capital)  / (n - 1)
> 
> and so that's the more general code.
> 
> Nick
> 
> On Wed, Feb 23, 2011 at 8:49 PM, Waedlich Felix <fwaedlich@gmail.com> wrote:
> 
>> I have a panel data set with 140 countries over a time period if 28 years and I want to analyze determinants of capital regulation.
>> 
>> I want to estimate to what extent the level of regulation is influenced by the observable levels in specific reference groups (cultural, regional, etc.) Therefore I planned to generate variables based on the average restrictivness in these groups, which I will use as explanatory variable for my regression.
>> Practically i have a dependent variable (capital) and several dummy variables which are supposed to serve as a filter to generate specific regulation averages for each country and year. I.e. all European countries like Belgium, France, etc. will look at the same level of restrictivness in 1978.
>> Since, I am rather unexperienced with Stata, I could only came up with this egen code:
>> 
>> . bysort year: egen mean_capital=mean(capital)
>> 
>> So it looks like this:
>> 
>>     +---------------------------------+
>>     | mean_capital         country   year |
>>     |---------------------------------|
>>  1. | 3.848485   UNITED STATES   1978 |
>>  2. | 3.825243   UNITED STATES   1979 |
>>  3. | 3.847619   UNITED STATES   1980 |
>>  4. | 3.839623   UNITED STATES   1981 |
>>  29. | 3.848485          CANADA   1978 |
>>  30. | 3.825243          CANADA   1979 |
>>  31. | 3.847619          CANADA   1980 |
>>  32. | 3.839623          CANADA   1981 |
>> 
>> Theoretically, I need to generate this variable excluding the regulation level of the country I am observing. Meaning if there are four countries in one region, each country will only weigh in the level of regulation of the other 3 countries, but not his own regulation level.
>> 
>> 
>> Does anybody has a clue?
> 
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