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Re: st: Calculating Industry Experience


From   Michael Barker <[email protected]>
To   [email protected]
Subject   Re: st: Calculating Industry Experience
Date   Fri, 14 Feb 2014 07:33:55 -0500

I think what you're trying to accomplish can be done with a merge.

clear
use original_data

keep if Acq==1
rename year Acqyear
drop SIC
rename TargetSIC SIC
save Acqdata

clear
use original_data
keep if Acq==0
merge m:1 dir_id SIC using Acqdata

drop _merge
gen Industry_Experience = Acqyear-year

You will still have to sort out cases when TargetSIC may match more
than one SIC, such as in this case:

>>            10043    2007    1111         .           0
>>            10043    2009     .          1111         1
>>            10043    2010    1111         .           0

Maybe drop if Industry_Experience < 0

Mike


On Thu, Feb 13, 2014 at 2:35 PM, Nick Cox <[email protected]> wrote:
> Sorry, but I am still lost here. Are you saying 2009 - 2007 = 1?
> Nick
> [email protected]
>
>
> On 13 February 2014 18:39, Lawal, Olusola O <[email protected]> wrote:
>> I have over 100,000 observations and 200 variables on acquisitions and their directors, but 10
>> observations and 5 variables will be enough to show the problem.
>> My data looks like this
>>           dir_id     year    SIC     TargetSIC        Acq
>>          --------------------------------------------------
>>            10043    2007    1111         .           0
>>            10043    2007     .          1450         1
>>            10043    2008    1113         .           0
>>            10043    2009     .          1111         1
>>            10043    2010    1111         .           0
>>            13944    2007    1112         .           0
>>            13944    2008    1113         .           0
>>            13944    2009    5760         .           0
>>            13944    2008    1113         .           0
>>            13944    2009     .          5760         1
>>          ---------------------------------------------------
>>
>> I am trying to calculate industry experience based on matching SIC with TargetSIC of the director (dir_id) which is the difference (in years) from a time when Acq = 1 to a time when Acq = 0. In a different format, what I would like to calculate is the variable IndustryExperience below.
>>
>>
>>            dir_id     year    SIC     TargetSIC     Acq       IndustryExperience
>>          --------------------------------------------------------------------
>>            10043    2007    1111         .           0               .
>>            10043    2007     .          1450         1               .
>>            10043    2008    1113         .           0               .
>>            10043    2009     .          1111         1               1 (2009 (1111 from TargetSIC) - 2007 (1111 from SIC))
>>            10043    2010    1111         .           0               .
>>            13944    2007    1112         .           0               .
>>            13944    2008    1113         .           0               .
>>            13944    2009    5760         .           0               .
>>            13944    2008    1113         .           0               .
>>            13944    2009     .          5760         1               1 (2009 (5760 from TargetSIC) - 2007 (5760 from SIC))
>>          ---------------------------------------------------------------------
>>
>>
>> The problem I have is that I don't know how to attach grab a specific year and make it a reference point for other years within the same dir_id.
>>
>> I am fairly new to Stata, but I imagine a loop and a global variable would do the trick?
>> Any suggestions would be greatly appreciated!
>>
>>
>>
>>
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