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Re: st: Calculating Industry Experience


From   Nick Cox <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: Calculating Industry Experience
Date   Thu, 13 Feb 2014 19:35:14 +0000

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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