Hello everybody: I am trying to estimate a SUR system with some restrictions in the parameters by means of the menu that Gretl has. I am able to introduce the different equations properly, but although I write the restrictions in the screen the results I obtain don't take these restrictions into account. The code I introduce is something like: equation x10 x2 x3 x4 x5 equation x6 0 equation x7 0 restrict b[1,2]=b[2,1] Thanks in advance Cheers Javi