I'm also a beginner with using Mplus. I used Mplus to test 2 models: a mediation model and a moderation model, both with the same ordinal outcome measure. In the mediation model I used a bootstrap and in the moderation model MLR. However, I was wondering, since I want to compare the 2 models on fit, which model fit indices I should and could report comparing these 2 models. It seems that I cannot get similar fit indices: the mediation model, with the bootstrap, only reports WRMR, and the moderation, using MLR, only reports BIC and AIC. furthermore, the WRMR in the mediation model is .003. I thought that the WRMR should be < .09 to be considered an adequate fit. However, the above post stated that WRMR should be around 1 to be considered adequate. Is the latter true?
WRMR is an experimental fit statistic and I would not use it. With bootstrap we don't give fit statistics. We bootstrap only the standard errors. You can run the analysis without BOOTSTRAP and obtain regular fit statistics.
When means, variances, and covariances are not sufficient statistics for model estimation, chi-square and related fit statistics are not defined and are not available.
Thank you for your quick response. I just have one more question, is it correct to use a bootstrap in the final analyses and report these results (estimates and s.e. etc.), however, also report the fit measure e.g. RMSEA for the same model, obtained without using the bootstrap?
I am using mPlus version 5. I preformed a CFA with a combination of binary and continuous variables; however, the output only provides RMSEA and WRMR. Should I be concerned that chi-squared and CFI are not included? Thank you,
It seems odd that you get RMSEA but not chi-square. We don't support Version 5. I would suggest upgrading and if you find the same thing sending the output and your license number to email@example.com.