[Gretl-users] Sequential restrictions in systems

Hi, it's unclear to me whether (and if so, how) it's possible to restrict simultaneous-equations system sequentially. What I mean is something like this: <pseudo-hansl> toberestricted <- system ... end system estimate toberestricted method=ols # unrestricted restrict b[1,1] = 0 # for example end restrict estimate toberestricted method=sur # one restriction applied restrict b[2,1] = 0 # again, an example end restrict estimate toberestricted method=sur </pseudo-hansl> What I would like is that the last estimation command takes into account both previously defined restrictions, but that the test just evaluates the last restriction, relative to the system with the previously imposed first restriction. (There is a similar mechanism in the VECM context when restricting the cointegration relations; in the GUI there is a tickbox for deciding whether to test all restrictions, or just the last ones.) Thanks, sven