[R] Pseudo R2 for Tobit Regression

[ldotero]

Dear All:
I need some guidance in calculating a goodness-of-fit statistic for a Tobit
Regression model.  
To develop the Tobit regression, I used the tobit() method from the AER
package, which is basically a simpler interface to the survreg() method.  

I've read about pseudo R2 and C-index and was wondering if there is a
package that calculates this for me.  Also, is there a reason to select
pseudo R2 over C-Index, or viceversa?

I will appreciate any suggestions.

Many thanks.
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