El Miércoles, 26 de Octubre de 2005 09:10, maite escribió: Maite, you must have into account that you are creating a new dataset in a new file. So, for working with the 1000 obs. of bhat you saved, you must close your current dataset and open the file test.gdt you created. I run the program ---- nulldata 50 genr x=100*uniform() loop 1000 --progressive genr eps=3*normal() genr y=5+2*x+eps smpl (obs<26) --restrict ols y const x genr bhat=coeff(x) store test.gdt bhat endloop --- and it worked for me (gretl version 1.4.1 in Mandrivalinux 2005). If it is not working in your case, Allin will need to know your gretl version and operative system (Windows 98, XP, Linux ...) for trying to solve the problem. -- Ignacio Díaz-Emparanza Dpto. de Economía Aplicada III (Econometría y Estadística) UPV-EHU http://www.bl.ehu.es/~etpdihei/