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Re: st: Adding a variable to a panel dataset


From   Jason Hecht <jayhstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Adding a variable to a panel dataset
Date   Tue, 2 Oct 2012 13:11:55 -0400

Joerg, Chris -

I initially created the panel out of individual years.  In doing so, I
did, in fact, create a new variable called "nation" that exists for
each observation in the full dataset (e.g., "China" is repeated for
each firm year observation for any firm located in China).

So now I just need a way to get the unemployment rate for each country
(from 1998 to 2008) slotted into the appropriate firm-level panel.

Can I use my "nation" variable to do this?  I believe I should be able
to merge the 11-line dataset (with the country unemployment rates)
into the full dataset.  For example, I can use "China" (a name in the
11-line 'text' dataset) to match with "China" which also appears in
the "nation" variable in the full dataset.

Is this the way to proceed?

Thanks so very much for your help.

Jason


On Tue, Oct 2, 2012 at 10:12 AM, Joerg Luedicke
<joerg.luedicke@gmail.com> wrote:
> If I understand the problem correctly, you will need to -reshape long-
> (see -help reshape-) your country dataset. You will then need a
> country identifier that is the same in both of your datasets. If you
> don't have such an ID yet you may want to create one. Then you can
> simply merge country and firm-level data by this ID and year.
>
> J.
>
> On Mon, Oct 1, 2012 at 11:39 PM, Jason Hecht <jayhstata@gmail.com> wrote:
>> Chris -
>>
>> A point of clarification:
>>
>> In the example that you provided, it appears that the "wpid" file has
>> as many obs. as the "employee" file.
>>
>> My problem is that I have 7 different country dummy variables that
>> identify where the individual firm is located.  However, I want to
>> create a single variable that will have the unemployment rate (from
>> 1998 to 2008) mapped into each firm's panel.
>>
>> So let's say my "wpid" is called "unrate" (a text file) which will
>> have 11 lines and 14 columns arrayed as:
>>
>> 1998  China 8.9  Fra  6.4 . . . US  5.4
>> 1999  China 8.3  Fra  5.8 . . . US  4.5
>> .              .              .      .            .     .
>> .              .              .      .            .     .
>> .              .              .      .            .     .
>> 2008 China 7.2   Fra  8.2. . .  US   7.5
>>
>> where the above variables would be named as "year" "China" "RUNCChn"
>> "Fra" RUNCFra" .... "US" "RUNCUS"
>>
>> Now I would need to merge the above dataset with my analagous
>> "employee" dataset which has 155,386 firm-year panel observations
>> (firm id #'s go from 1 to 14,126 and year (1998-2008) is a variable.
>>
>> I'm not sure if your FAQ example would work because I need to merge
>> unempoyment rates for seven different countries into the firm-level
>> panels.
>>
>> I'm sorry if I am misinterpreting the FAQ example.  I'm relatively new
>> to STATA and am learning how to use the programming commands.
>>
>> Kindly advise and thanks so very much for your help.
>>
>> Jason
>>
>> On Mon, Oct 1, 2012 at 7:04 AM, Christopher Baum <kit.baum@bc.edu> wrote:
>>> On Oct 1, 2012, at 2:33 AM, Jason wrote:
>>>
>>>> I have constructed a panel dataset containing data on +14,000 firms
>>>> from 1998 to 2008.  I created a dummy variable that identifies the
>>>> country where each firm is located (i.e., China, France, Germany,
>>>> Japan, India, UK, or US).
>>>>
>>>> I now want to add the unemployment rate for each country that would
>>>> map into each firm's panel. That is, I would like a single column that
>>>> would match the country's unemployment rate to the panel of the
>>>> individual firm.
>>>>
>>>> Is there a relatively easy way to do this?
>>>
>>> This is a FAQ:
>>>
>>> http://www.stata.com/support/faqs/data-management/group-characteristics-for-subsets/
>>>
>>> Kit
>>>
>>>
>>> Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
>>>                              An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
>>>   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html
>>>
>>>
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