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st: Heteroscedasticity test

From   Gonzalo Ruiz <[email protected]>
To   [email protected]
Subject   st: Heteroscedasticity test
Date   Sat, 16 Jul 2005 06:44:28 -0500 (CDT)

I know this is a very basic question question, but
please, help me, I am a Stata newbie. 
In some tutorials I have read that the
Breusch-Pagan/Cook-Weisberg test for
heteroscedasticity should be run after the regression
only as:


But in other tutorials I have read that it should be
run as:

hettest resid

where resid is the name of the residuals. Needless to
say, these options yield different results. 
How is this command used properly?

Also, it is interesting, because sometimes I find
heteroscedasticity using "hettest", but there is no
heteroscedasticity according to the White test
("whitetst") or "hettest resid". 

Thank you, your help will be much appreciated.

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