Dear All, It is my first time using Gretl, I love it. I am trying to estimate a cost function system of equations (Jorgensen 1986). I am imposing restrictions on the parameters to impose cost exhaustion and homegeneity conditions. I am using a cross sectional dataset of electric power plants in the US--I am researching the impact on cost of generation of availability of water and the selection of cooling systems. I would really appreciate it if you can look at my Gretl instructions and tell me if I am making any mistakes--when I ran the model I get no results. These are the instructions: ************************************************** system equation S_Dep l_P_Dep l_P_labor l_Y equation l_Tot_cost l_P_Dep l_P_labor l_Y sq_l_P_Dep l_Dep_labor l_S_labor l_Dep_Y l_labor_Y sq_l_Y end system restrict b[1,1] = b[2,2] b[1,2] = b[2,5] b[1,3] = b[2,6] b[1,4] = b[2,8] b[2,2] + b[2,3] = 1 b[2,8] + b[2,9] = 0 b[2,5] + b[2,6] = 0 b[2,6] + b[2,7] = 0 end restrict estimate ******************************************************************************************** Cheers and thanks, Carlos