Hello: I have the following R output from the zelig for fitting a tobit model: Call: zelig(formula = il6.data$il6 ~ il6.data$apache, model = "tobit", data = il6.data, robust = TRUE, cluster = "il6.data$subject", weights = il6.data$w) Value Std. Err (Naive SE) z p (Intercept) 4.572 0.12421 0.27946 36.8 1.44e-296 il6.data$apache 0.983 0.00189 0.00494 519.4 0.00e+00 Log(scale) 2.731 0.00660 0.00477 414.0 0.00e+00 Scale= 15.3 Gaussian distribution Loglik(model)= -97576 Loglik(intercept only)= -108964 Chisq= 22777 on 1 degrees of freedom, p= 0 (Loglikelihood assumes independent observations) Number of Newton-Raphson Iterations: 6 n=5820 (1180 observations deleted due to missingness) After the fitting the above Tobit model using zelig, if I use the following command then I can get the regression coefficents: beta=coefficients(il6.out) (Intercept) il6.data$apache 4.572 0.983 How may I extract the "Naive SE" from the following output please? I would appreciate if any help you could provide me in this regard please. Thank you. Sattar ____________________________________________________________________________________Yahoo! oneSearch: Finally, mobile search that gives answers, not web links. http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC