Hi Pedro Afonso Cortez ;

Could you try to Factor 10.9 software to understant case. If Omega is higher than 1.00, it means that your residual variance is negative. If it is negative there is improper solution. Check the Mplus output.

Bests

Abdullah Faruk Kılıç , thanks for your answer.

I checked the output and there is no negative residual variance. Also, I got it higher than 1.00 in CI (upper 2.5%) for 1000 bootstraps. Anyway, I guess it confirmed part of my initial guess: once, residual variance of items is influenced by 'F1 and 'FRI' (there's items that integrate both factors), it probably confuses the calcs. I'll check Factor and try other approaches.

Bests

You may have a convergence issue or too fine of parameterization.

Hope this helps

Matt

Hi Pedro,

I can't see how it can be larger than one given your denominator includes everything in your numerator, PLUS the residuals (therefore, you should have a larger denominator).

I have used Omega frequently, and usually do it by hand (ok, I mean excel!). Maybe give that a try to compare.

It might be in your Mplus programming ... perhaps a mislabel, or your formula goes over Mplus' allowed line width (90 characters i think?).

Oh, one other thought as I look at the Mplus syntax. You typically use the standardised output for the Omega calculation. But I don't see the syntax asking for stdyx in the OUTPUT.

Hoping to help,

Tim

Thanks, Tim. I used standardized output (as I mentioned, it isn't the full syntax, just an example). Also, I double checked the labels and line width. Thanks again! In fact, I did not get higher than 1.00 in the regular value, it was in CI at upper 95% for 1000 bootstraps. Anyway, I've already solved it using psych for the analysis. Bests!

Good to hear Pedro. Cheers.