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I am working on an exploratory factor analysis of dichotomous items. I've found this post extremely helpful. However, Mplus seems to be a standard that journals in my field are expecting, and I would love to replicate Mplus results in R.

I've gotten my results to come very close to Mplus, using the fa function on a polychoric correlation matrix (created with the hetcor function) and the geominQ rotation. It seems that the major difference between the fa function and Mplus is that the latter uses a robust weighted least squares factoring method (WLSMV - a diagonal weight matrix), whereas the former uses a regular weighted least squares (WLS) factoring method.

Has anyone managed to use R to replicate Mplus factor analysis for binary items? Has anyone figured out how to implement WLSMV in R?

Thanks!

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    $\begingroup$ aside...Mplus can also generate bootstrap standard errors - advised to try and account for the extra variability in polychorics - see ch12 of mplus examples on how to implement. $\endgroup$ – user20650 Apr 3 '13 at 19:48
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What you want is in the lavaan package, the function is named sem. Try writing an argument estimator = "WLSMV". For more information read this.

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    $\begingroup$ i dont think there is an example of efa in lavaan package but look at efa in a cfa framework example at amarkos.gr/research/lavaan for how to implement. Wish i had noticed this before. $\endgroup$ – user20650 Apr 3 '13 at 20:01
  • $\begingroup$ Thanks AAA and user20650, this is looking promising -- I'm still messing around with the options for the sem function and will update here once I figure it out. $\endgroup$ – sprins123 Apr 7 '13 at 16:34

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