On Tue, 11 Jan 2011, Allin Cottrell wrote: > Part of my motivation for the switch was that if you give a > restriction such as "a[1] = 0" (with a single index) this means > that all EC coefficients in equation 1 are restricted to zero, or > variable 1 is weakly exogenous. And it seemed more intuitive that > if you give just one index it should be read as the leading one, > not the trailing one. This makes good sense, but does it warrant a compatibility breakage? I'm with Sven on this one.