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?
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