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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


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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