Thresholds are not in order

mspiegel's picture
Project:OpenMx
Component:Code
Category:bug report
Priority:normal
Assigned:Unassigned
Status:active
Description

From http://openmx.psyc.virginia.edu/thread/1443:

I wrote a simple OpenMx script to do LCA on ordinal variables. It works fine on simulated data. When I run it on real data, the estimated thresholds are not in order. I then included constraints on the thresholds (simple enough to do) so that they are monotonically increasing. This seems to work as the threshold estimates monotonically increase. From reading the manual, I was sure constraints weren't necessary.