Hi, yet another TSLS question from me I'm afraid... The TSLS command also prints the Hausman and Sargan tests, so far so good. Then after that *sometimes* it also prints the value of the F-statistic in the first-stage regression, giving a rule of thumb for weak instruments. But it doesn't do that every time, and I fail to see the rule when does it print this information and when does it not. Could somebody please explain? Also, I don't see any remark in the output on whether I used a HAC covariance matrix estimator or not. (This actually also seems to apply to plain OLS, was this the case already in earlier versions? All this is with 1.7.0 on windows.) Thanks, Sven