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st: Geary Hinkley Transformation

From   miltonMARX2010 <>
Subject   st: Geary Hinkley Transformation
Date   Wed, 25 Aug 2010 13:52:00 -0700 (PDT)

I have the following problem:
1. I regress y on x1, x2,...xk. Estimation done using datset A.
2. using the beta estimates I predict y for two new datasets B and C. The
predicted ys are Y^{B} and Y^{C}.
3. I need to find the mean and variance of D=(Y^{B}-Y^{C})/Y^{B} using the
Geary Hinkley Transformation so the I can construct a confidence interval
for predictions of D.

How do I execute stage 3 using STATA? 
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