Dear Sirs and Madams, I am a user of "gretl" programme and would on some clues. The program is really absolutely awesome. You can really everything well statistically evaluate and present. I noticed immediately that Gretl offers the elemetarste function not can calculate, the addition of monitoring within the variables. So say the "sum" is missing. I would very pleased if your developers would include this function in the next version. With kind regards Özay Canpolat E-Mail: Oezay.Canpolat(a)gmx.de -- Özay Canpolat