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st: Sample selection?

From   "Suryadipta Roy" <[email protected]>
To   [email protected]
Subject   st: Sample selection?
Date   Sat, 12 Jan 2008 11:54:41 -0600


My dependent variable is continuous taking negatitve to positive
values. In order to convert it into logarithms, I used a positive
transformation and then ran the regression with the logarithm value as
the dependent varible. I am finding that the values of the
coefficients of my explanatory variables are different from the one
when the original value was used as the dependent variable. I was
wondering if I need to address sample selection issues when I am using
the logarithm and thereby constraining the variable to be positive
only, and why the values of the coefficients differ in the two cases.

Also, my main explanatory variable is categorical in nature ( 0 - 10).
Is it alright to treat this as a continuous variable in the
regression? Any insights/directions on these issues will be greatly

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