[Gretl-users] concerning the commands for double bounded DC in contingent valuation

Hi, My name is Dorian, I'm trying to estimate the data of a double bounded dichotomous choice (contingent valuation) thanks to a maximum likelihood estimation with a linear specification (From E. Flachaire). But when I put the command, then GRETL gives several errors messages as "missing values found". I think the model may not be specified for linear. But it is strange because when I put initial values quite high (5) then it converges but I don't know if results are "possible". May someone help me? Here is the code genr alpha=3 genr sigma=1 logl=(1-CD1)*(1-CD2)*log(Pnn)+(1-CD1)*CD2*log(Pny)+CD1*(1-CD2)*log(Pyn)+CD1*CD2*log(Pyy) series Pnn=1/(1+exp(-(BID2-alpha)/sigma)) series Pny=1/(1+exp(-(BID1-alpha)/sigma))-1/(1+exp(-(BID2-alpha)/sigma))+(BID2>BID1)*100 series Pyn=1/(1+exp(-(BID2-alpha)/sigma))-1/(1+exp(-(BID1-alpha)/sigma))+(BID2<BID1)*100 series Pyy=1-1/(1+exp(-(BID2-alpha)/sigma)) params alpha sigma And attached you have the results if I set the initial values at 5. Thank you very much !! -- Dorian LITVINE Docteur en Sciences Economiques Chercheur (associé) en Economie de l'Energie et de l'Environnement Research Associate in Economics (PhD), specialized in Energy/Environment, Green Electricity, and pro-ecological decisions Laboratory LASER-CREDEN (Energy Economics Institute) Faculté des Sciences Economiques CS 79606 34960 Montpellier Cedex 2 -- FRANCE Tel : (office) 00 33 (0)4 67 15 83 32 (mobile) 00 33 (0)6 89 15 15 74 E-mail : dorian.litvine(a)univ-montp1.fr / dorian.litvine(a)gmail.com CREDEN website: www.creden.univ-montp1.fr