How does OpenMx handle missing data with WLS?
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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?
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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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.
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