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You just have some syntax errors. x1_2 isn't x^2, and cos by itself doesn't mean anything. You might want to check the help system. Yes cos by itself seemed weird to me but the point is to make non-linear models and I'm not sure how to specify the last term. Now I have: y1=C(1)+C(2)*x1+C(3)*x1_2+co...

Hey I'm trying to estimate the following GMM model: y1= ß0 + ß1x1 + ß2x1^2 + cos(ß3x1) + e1 y2= b0 + b1x1 + b2x2 + sin(b3x2) + e2 First I tried to specify this system: y1=C(1)+C(2)*x1+C(3)*x1_2+C(4)*cos_x1 @ cos_x1_ y2=C(5)+C(6)*x1+C(7)*x2+C(8)*sin_x2_ @ sin_x2_ And I got it was a near singular matr...