Re: [Gretl-users] Re: Gretl-users Digest, Vol 30, Issue 14

Thank you for your reply. The point is that I'd like to constrain the fitted values (and not the observed ones) of the dependent variable. The problem is that my depedent variable cannot "physically" (i.e., in real world situations) extrapolate a certain range of values (thus all my observed values lie within this range) but when I run the regression some of the fitted values are, in fact, outside this range (although the general fit of the model is good). So I need a kind of Tobit model, but I need to specify not only the lower bound but also the upper bound of the range. The Tobit command in GRETL constrains the lower bound to zero (whenever the fitted values are negative), but it does not specify an upper bound (and it does not allow me to specify a lower bound other than zero). Best regards, Thiago