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...upation+rating) # view results results That gives me the right coefficients, but the SEs are all zero, so I cannot get 95% confidence intervals... Any help is welcome... Ravi -- View this message in context: http://r.789695.n4.nabble.com/Bootstrapped-Tobit-regression-get-standard-error-0-tp4525760p4525760.html Sent from the R help mailing list archive at Nabble.com.