How does OpenMx handle missing data with WLS?

Posted on Mon, 09/28/2020 - 13:05

jpritsker Joined: 09/27/2020

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I might be missing something obvious, but as far as I can tell, this isn't explicated anywhere. How does OpenMx deal with missing data for WLS? Is it listwise/pairwise or is the polychoric covariance matrix computed using FIML?

Replied on Mon, 09/28/2020 - 14:13

jpritikin Joined: May 23, 2012

missing data

mxData offers an naAction option. If you don't exclude missing data then it is ignored pairwise. There isn't really a correct way, math-wise, to handle inconsistent sample sizes in a covariance matrix. It just does the best it can.

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Replied on Fri, 10/02/2020 - 11:09

AdminNeale Joined: Mar 01, 2013

Not FIML

HI

It's FIML-pairwise. FIML is used to estimate the polychorics, but the variables go into the ark two-by-two, so it isn't FIML. Note, however, that this is likely a lot better than listwise deletion throughout.