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

By *tbates*

Created *05/01/2012 - 11:22*

Tue, 05/01/2012 - 11:22 — tbates [1]

hi all,

When mxData [2] is a cov or cor matrix, numObs is just one number.

Quite often the cells in a covariance matrix could take advantage of different numbers of observations.

Two questions: has anyone made RAM models with an "numObs" matrix to give a per-cell n? And second, are the assumptions of a covariance-based model violated if all data do not come from complete subjects?

**Links:**

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

[2] http://openmx.psyc.virginia.edu/wiki/mxdata

[3] http://openmx.psyc.virginia.edu/thread/1396

[4] http://openmx.psyc.virginia.edu/thread/1383

[5] http://openmx.psyc.virginia.edu/forums/openmx-help/openmx-structural-equation-modeling