Dear R-List, I am using Tobit regression models to estimate censored dependent variables (using survreg in the survival package). I have 2 questions: 1) Is there any package providing specification tests for Tobit models (Hausman test proposed by Newey (1987), Journal of Econometrics, White Information Matrix test or any other test I do not know about so far)? 2) Are there any packages that implement SUR or simultaneous equations for censored regression? Thanks in advance, Malte Malte Brockmann malte.brockmann at ebs.edu