You mean you removed an eta and the objective function went down? I dont think
this can really happen in a straightforward way.
In NONMEM, the minimum of the objective function is found and if having all
etas to zero gives a lower objective function than some other eta values then
barring coverg
Xinting,
Try to start from the initial conditions of your "reduced" model but add
that "reduced" ETA with the corresponding OMEGA equal to 0.01 or other
small number. If the control stream code is correct, the objective
function should decrease or retain the same value.
Leonid
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