search for: solvetol

...â1 in all equations is the same value, and the same for all the other coefficients). When I try to run the model without the restricting equations (C2, C3) it runs just fine, but when I add these two equations I get the error: "Error in solve(xtOmegaInv %*% xMat2, xtOmegaInv %*% yVec, tol = solvetol) : cs_lu(A) failed: near-singular A (or out of memory)" Any ideas on what the problem might be? All the best, Rui Neiva P.S.: I've also posted this question on the Matrix help forum, but since I do not know how active that forum is I've decided to see if anyone in the mailing list...

I might be sorry for asking this question :-) I have two equations and I tried to estimate them individually with "lm" and "gls", and then in a system (using systemfit) with "OLS", "WLS" and "SUR". Quite surprisingly (for myself at least) the results are identical to the last digit. Could someone (please!) give a hint as to what am I