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st: Heteroskedastic Probit

From   Jeffrey Lyons <Jeffrey.Lyons@Colorado.EDU>
Subject   st: Heteroskedastic Probit
Date   Wed, 2 Dec 2009 10:07:23 -0700 (MST)


I am learning Heteroskedastic Probit and am having some difficult.  I cannot find the stata code for doing differencing on the variables in the Variance Model.  Also, I am unsure of how to then display this graphically.  Thank you so much for your help!

Jeffrey Lyons
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