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st: Regression question


From   "Mike Kim" <kalisperos@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Regression question
Date   Fri, 25 May 2012 08:52:28 -0500

Hi all,

This question is not about Stata, but I would appreciate your opinion. I
wonder whether the following regression (e.g., OLS) makes sense. 

Y(i) = b0 + b1*X1(i) + b2*X2(ij) + e(i)
That is, Y varies by i, but some independent variables vary by i and j. Each
Y(i) is repeated j times, so data structure is:

Y     X1   X2
10   2    1	
10   2    2
10   2    3
20   3    4
20   3    5
...

For example:
i: company, j: adverting spending by media (TV, Newspaper, etc.)
REVENUE(i) = b0 + b1*R&D SPENDING(i) + b2*AD SPENDING BY MEDIA(ij) + e(i)

Thank you for your help in advance.
Mike.


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