You are here

How does OpenMx handle missing data with WLS?

3 posts / 0 new

Log in or register to post comments

Last post

Mon, 09/28/2020 - 14:05

#1

jpritsker's picture

jpritsker

Offline

Joined: 09/28/2020 - 00:32

How does OpenMx handle missing data with WLS?

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?

Mon, 09/28/2020 - 15:13

#2

jpritikin's picture

jpritikin

Offline

Joined: 05/24/2012 - 00:35

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.

Fri, 10/02/2020 - 12:09

#3

AdminNeale's picture

AdminNeale

Offline

Joined: 03/01/2013 - 14:09

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.