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st: RE: Strmatch across rows


From   "Lawal, Olusola O" <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   st: RE: Strmatch across rows
Date   Wed, 12 Feb 2014 14:47:36 +0000

I'm having a problem with using strmatch across rows and columns. I am using Stata 13 for Windows. 

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 match (SIC) of the director (dir_id) which is the difference (in years) from a time when Acq = 1 to a time when Acq = 0 and strmatch =1.

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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