Hello again, I noticed that the diagnostic LM tests for autocorrelation (--autocorr) and heteroskedasticity (--white) are not available after TSLS. (This occurred in a script, haven't checked the GUI.) Is there any particular reason for it (apart from the classic "development time is limited...")? And why then is the arch test (--arch) possible? Has it slipped by, possibly not doing the right thing in the TSLS case? Thanks, Sven