Hi, while trying out the 2SLS estimation for a simultaneous equation model: IS-LM Model (Asteriou, 2006), I ecountered the following problem (see test case attached) You can see from the attached output that although three instrument variables (M, I and M_1) are specified, only one, I , was used in the estimation. Please advise. Thanks and have a nice day. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com