Published on *OpenMx* (http://openmx.psyc.virginia.edu)

By *brauer*

Created *05/02/2012 - 14:23*

Wed, 05/02/2012 - 14:23 — brauer [1]

Hi, is there a way to get the Lagrange Multiplier Test with OpenMx? I am usually not a fan of this type of data-driven test but I am currently analyzing a dataset where a LM Test might help me understand what is going on. I am running a four-factor CFA model with three indicators. The fit is OK but not great. The correlation residuals tell me that I am drastically underestimating the relationship between one indicator of the first factor and one indicator of the second factor. But then, when I allow the measurement errors of these indicators to covary, the model fit hardly improves and the estimated covariance between the two measurement errors is close to zero. I don't get it. Maybe a LM Test will help me understand what is going on in these data.

**Links:**

[1] http://openmx.psyc.virginia.edu/users/brauer

[2] http://openmx.psyc.virginia.edu/thread/1390

[3] http://openmx.psyc.virginia.edu/thread/1323

[4] http://openmx.psyc.virginia.edu/forums/openmx-help/openmx-general-help