MODIFICATION Indices in Mplus
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- Опубліковано 4 вер 2022
- QuantFish instructor Dr. Christian Geiser explains how to obtain and interpret modification indices when running structural equation or confirmatory factor models in the Mplus software.
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Thanks for the helpful videos! In this video you explain WITH statements. What are BY statements in the model modification indices section of MPlus output?
Hi Justin,
The BY statements refer to factor loadings.
Best, Christian Geiser
@@QuantFish Thanks for the quick reply!
Thanks for This useful video Dr. Geiser. I would like to ask about one of your published books. I cannot the one titled "Advanced Multivariate Data Analysis with Mplus". Is there a way to obtain it and in English? Thanks in advance!
Hi Paolo, Thank you for asking. Unfortunately, this book never materialized. Best, Christian Geiser
How does one know based on the modification indices when to remove a factor? It seems that they always suggest adding parameters, not removing them. What if the misspecification occurs because we are loading an indicator to the wrong factor, how can the modification indices let us know that that is happening?
Hi Daisy,
Modification indices (MIs) refer to underspecified models (models in which certain types of parameters are missing), not overspecified models. MIs are not going to show you when you have too many parameters (e.g., too many factors) because having too many parameters typically does not cause overall chi-square model misfit.
Modification indices may suggest cross-loadings if those are the source of chi-square model misfit (model underspecification, missing parameters). Overall, you should not overestimate the value of MIs. MIs are completely atheoretical and often, suggested modifications do not make theoretical or substantive sense. Resulting modified models may be non-sensical or may capitalize on chance. I only use MIs as ONE diagnostic tool to help me understand why a model does not fit. I would never base model respecification solely on MIs.
Best, Christian Geiser
@@QuantFish thank you!