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...L, hessian = T) confint.par <- sqrt(diag(solve(regression$hessian *-1))) now that I have confidence intervals for each parameter, how can a draw confidence bands for the mean regression line? Any help will be appreciated. Cristián Montes Site Productivity Division Head Bioforest S.A. Chile. [[alternative HTML version deleted]]

Dear R-users, I would like to model data where the response variable consists of many minus ones and many different positive values that seem to follow an apparently separate distribution (ie. -1, -1, 0.5, -1, 3, 3.5, 1.2, -1, -1, 0.4, etc); no values of the response can be less than minus one or between minus and zero (exclusive). I am aware of tobit regression but unaware of exactly how to