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st:Transformation for skewed variables with negative values?


From   Woong.Chung@colorado.edu
To   statalist@hsphsun2.harvard.edu
Subject   st:Transformation for skewed variables with negative values?
Date   Tue, 15 Aug 2006 09:19:03 -0600

Hello.
I need following help. I have panel dataset for estimating a simple linear
equation.
The problem is that my all variables have sknewness and big variation(large
std).
In particualr, the dependent variable and one of independant variables have a
negative sknewness, while all other independant variables are shown by positive
sknewness. My first intension is using a log transformation of all variables but
seems not to be a good idea since all variables have negative values (around
20%)
Besides, all variables except one of independant variables are ratio, thus that
idea would make worse.

I would be so glad if anyone has suggestions to solve this problem

THANKS

WT

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