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st: ST: OLS prediction

From   Laura Platchkov <>
To   "" <>
Subject   st: ST: OLS prediction
Date   Fri, 18 Sep 2009 18:00:40 +0100

Dear all, 

I have a cross sectional dataset, and use OLS. This is the model:

ln(Y) = b1 + b2X + b3Z + e

I would like to do some predictions to compare the change in Y when the X has, let say 10 units more: 

ln(Y)* = b1 + b2(X+10) + b3Z + e

and compare the change: 

Y*- Y

How can I do exactly? I have created a new dataset with the modified values of the regressors, but I don't know which command I should use to compute the value of the dependent ln(y*) with the new regressors. 

Thanks a lot!

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