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Several core users report models (typically running for many hours) returning as if the run was successful, but the returned model is marked as never run, contains no output.
I think all cases involve ordinal/binary data or joint ordinal.
CSOLNP is known to have this behavior, May affect NPSOL as well: need to check and update this bug report
Happens with 1 core as well as several.
Mike suspects optimiser finds an -Inf log likelihood and quit.
We should at least return a code red and the parameters from the lowest -2ll (constraint-satisfying) run rather than confuse the user by claiming they never tried to run the model ( which is what summary says
Better yet of course to be able to run realistic joint ordinal models without error...