when I simulated the model, I found the -2LL value of some nested models (which had less estimate parameters than full model) were smaller than that of full model, without any "warning" in script. I think it is abnormal, and I have no idea why it happened, and could you give me some information or suggestion to solve this problem.
In Mx, there are some order to help me to find the best start value, like "option THard=-n" or "option jiggle", so, is there any order in OpenMx with the same function. Could you give any clue?
Thank you again!