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

By *rlucas*

Created *02/25/2011 - 16:56*

Fri, 02/25/2011 - 16:56 — rlucas [1]

I'm running a multiple-group model with 17 groups (using raw data). However, the number of observations that is reported is wrong. Instead of reporting the total N across all groups, it reports N X the number of groups. In other words, the full sample size across all groups is 20814, but summary reports numObs as 353838 (which is 20814*17). When I ignore the groups and run the model on the full sample, I get the correct number of observations (20814), but if I run it as 17 groups (with each group being a subset of the 20814), I get 353838 observations.

I am pretty sure that I am not specifying the model incorrectly and inadvertently using the full sample for all groups. The results match my mPlus output, and the descriptive statistics and estimates do vary across groups. Is this a bug or am I missing something about why this should be reported this way (or could I be doing something wrong to cause it to report it this way)?

**Links:**

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

[2] http://openmx.psyc.virginia.edu/thread/822

[3] http://openmx.psyc.virginia.edu/thread/813

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