A bifactor ESEM rotation method question PreviousNext
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 Jacob Zimmerman posted on Tuesday, June 07, 2016 - 2:10 pm
Hello,

I conducted an ESEM with three factors (Rotation = Geomin). The results showed good overall global fit, substantial item loadings, etc.

However, I had expected to see significant factor correlations, but this was not the case (one factor was uncorrelated with the other two factors). The next step in my proposal was to conduct a bifactor model.

I realize it does not make much sense to conduct a bifactor model if one factor is uncorrelated with the others, but I thought it would still be interesting to show that the presence of a general factor accounts for a good deal of the variance of items on the two correlated factors, but does NOT account for much of the variance of the uncorrelated factor's items.

When I conduct this bifactor ESEM with "Rotation = BI-GEOMIN" interpretation of the specific loadings on one of the correlated factor's is rough (i.e., there are very few significant loadings).
With "Rotation = Target," I can make a lot more sense of the loadings on this specific factor.

I was wondering if it is appropriate to use Target rotation in a bifactor ESEM model after conducting a first-order geomin ESEM, if it helps with interpretation.

Lastly, I'm wondering if it would be recommended that I simply TAKE OUT the uncorrelated factor?

Thank you very much for your time.
Best,
J
 Tihomir Asparouhov posted on Tuesday, June 07, 2016 - 3:42 pm
If one of the specific factors is not significant then using a BI-GEOMIN with only 1 specific factor seems appropriate.

If (Rotation = Geomin) yields 3 factors where one of the factors is uncorrelated to the other two, then indicators loading only on the third factor would be uncorrelated with indicators loading only on the first two factors, meaning that the sample correlation matrix will have near zeros. In that case I would say that a bifactor model is unreasonable since the general factor tends to make most indicators correlated.
 Jacob Zimmerman posted on Wednesday, June 08, 2016 - 1:51 pm
Thank you,

Very much, for this prompt reply to my question (and for your work in this area in general).

I think I understand what you are saying, but would like to be sure.

My original ESEM (Rotation = Geomin) did indeed yield 3 factors, and yes, one of these factors was uncorrelated with the other two (range = 0.100-0.140; NS).

You are suggesting that a bifactor model is inappropriate to run on this aforementioned total solution (regardless of the rotation method); and this is because the general factor in a bifactor model would inflate the indicator correlations from this 3rd (uncorrelated) factor with the indicators which load onto the other factors (which you are right, do involve a lot of near zero values in the sample correlation matrix)?

So essentially, it is inappropriate to run because the bifactor model more-or-less assumes the presence of these correlations, and/or it magnifies them to some extent (i.e., it assumes factor correlations are present, otherwise, why would one do a bifactor model)?

I'm just trying to make sense of this, I think I almost get it.

Thanks again for your time if you or anybody else gets to this.

Best,
Jacob
 Tihomir Asparouhov posted on Wednesday, June 08, 2016 - 2:58 pm
I think you are correct Jacob.
 Jingtong Pan posted on Friday, June 02, 2017 - 8:05 pm
Hi,

I found this post interesting and wanted to learn more. Could you please share one or two references elaborating on why it is inappropriate to conduct a bifactor model if one first-order factor is uncorrelated with the others?

From a recent paper that I read, when running a bi-factor esem, "all factors are set to be orthogonal (i.e., the correlations between the S-factors and between the S-factors and the G-factor are all constrained to be zero)"(Morin, Arens, & Marsh, 2016). Is this procedure contradicting your earlier discussion that "a bifactor model assumes factor correlations are present"?

Thanks,
 Tihomir Asparouhov posted on Monday, June 05, 2017 - 9:57 am
Bifactor model assumes the presence of one general factor which causes all indicators to be correlated. If you have many near zeros in the sample correlation matrix of the indicators I would say that bifactor model is inappropriate. If one first-order factor is uncorrelated with another and there are no cross loadings the indicators for the two factors are independent of each other and thus bifactor model is inappropriate.
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