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st: two-way tobit

From   "Mueller,E (pgr)" <>
To   <>
Subject   st: two-way tobit
Date   Wed, 25 Sep 2002 08:34:21 +0100

Dear Statalist members,
I want to run a regression with a growth rate as dependent variable. For about 90% of the observations the growth rate is equal to zero, for 5% it is negative and for 5% it is positive. 
I learned that a two-way tobit, which can treat the zeros as a discrete variable with a mass point and the negative and positive growth rates as continuous variable, would be more appropriate than OLS.
Has someone already written a programme for this problem or for a similar problem?
My data is of the pooled cross-section time-series type, therefore I would like to get standard errors that are robust to heteroscedasticity and autocorrelation.
Many thanks in advance,
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