Good morning, I'm noticing a slight inconsistency (without practical implications) when I restrict coefficients in a system. Here's a partial output: In the first equation the restricted term (b[1,4] = 0) shows up like this: ECT2sub2_1 0.00000 2.76876e-09 2.716e-07 1.0000 while to give an example for the expected behavior I get in other equations (b[2,2] = 0): ECT1sub2_1 0.00000 0.00000 NA NA I suspect there may be something buggy going on, since 1e-9 should be bigger than machine precision (while for the t-ratio a value of 1e-7 just seems to indicate a side effect of a coeff around 1e-16 in combination with that standard error value). thanks, sven