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st: Missing standard errors for Tobit model
From
"Anderson Edward Dr (DEV)" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: Missing standard errors for Tobit model
Date
Wed, 31 Aug 2011 18:06:00 +0100
Hello,
I am trying to estimate a Tobit model with quite a lot of dummy variables - around 250, with another 10-20 other explanatory variables. I have around 7,000 observations although only about 700 of these are uncensored. When I run the regression using the tobit command, STATA generates coefficient estimates but there are dots where the standard errors should be.
Does anyone know if there is a way of avoiding this problem, or whether I am simplying trying to include too many dummy variables in the model? Any thoughts or advice would be much appreciated.
Many thanks,
Ed Anderson
UEA, Norwich
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