Type -help boxcox- for a primer, but if I were you, and I knew
something about your data, I might
. gen negy = -(y)
. poisson negy xvars, robust
since poisson is consistent (for a non-negative Y var) under very weak
assumptions.
On 4/3/06, golnaz s <[email protected]> wrote:
> Dear all,
> How can I estimate CoxBox and tobit in stata?
> my dependent variable are zero or negative.
> Thanks
> Golnaz Sedigh
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