test after tobit model

[Bouba Seydi]

Dear all,
I am impleting tobit model. But i have txo problems.
The first is about the homoscedasticity. When i apply whitetest, hettst, clad it say me that those test are only valid for regress. Does anyone know how to test homoscedasticity with the tobit model in stata?
The second is about the normality. Does anyone know how to correct when the residuals normality fall? i know that it is not necesary for the validity of the estimation but it is necesary to do the different test.
Thank you/

[naveed ahmed]

drukker(2002) install and implement tobcm after running a tobit which has a left censoring point at 0 with no right censoring. Conditional moment approach can also be taken.

[naveed ahmed]

test of normality

read microeconometrics by Cameron and trivedi