Message/Author 


I am wondering whether Mplus can save factor scores and standard errors from a level 2 (between level) factor. 


With SAVEDATA and the option SAVE=FSCORES, Mplus can save factor scores for a between level factor. Mplus does not compute the standard errors for the factor scores. 

Melvin C Y posted on Monday, February 06, 2012  10:10 pm



I am comparing the output using observed score obtained via summative score (15) and factor score method. In the factor score method, I ran an initial CFA with WLSMV estimator and saved the factor scores. I believe this is similar to the recomputing of raw scores into normalized scores procedure in Prelis. Both models had identical set up for within and between model commands. The model using summative observed scores converged. However, the model with factor scores could not converge with a long message that the estimated within covariance matrix is not positive definite as it should be. Did I miss something? Thanks, Melvin 


Please send the two outputs and your license number to support@statmodel.com. 


Dear Mplus team, I conducted a multilevel factor analysis model for students’ evaluation of teaching with students as level one and courses at level 2. One version uses categorical indicators and another one assumes the indicators to be continuous. I estimated factor scores of the level two latent variables and observed a zero correlation between the factor scores of the first and second model. The models have seven latent variables on within and between with no restrictions on loadings, intercepts, mean and thresholds. The estimator is always Bayes and the modelfit is fine. I estimate 50 plausible values (psv) and obtained a nonzero mean for the psv when I use categorical indicators although the mean of the latent variable is zero. However, correlating only the psv value of the first imputation of this model with the psv of the model using continuous indicators the correlation is reasonable high (.85). Additionally the distribution of this first imputation differs significant from the 49 other imputations. I would like to use the factor scores of the model with categorical indicators for further analysis. What am I doing wrong? Do I need to fix model parameters such as thresholds for the categorical indicator model? 


Please send data, the relevant outputs, and your license number to Support@statmodel.com. 


Hi Mplus team, I estimated within and between factor scores in a multilevel CFA model. I am wondering now how to use these factor scores as explanatory variables for further analysis. For one factor, a group mean centering is needed. Is it in this case appropriate to use the factor score of the between factor? Or should I use the aggregation of the within and between factor score and calculating the group mean of this aggregate? And for a second factor, I need the individual score for each subject in the cluster. So, should I use only the within factor score or should I aggregate within and between factor scores? Actually, I thought just to use the within score but compared to the manifest scores it seems more realistic to sum within and between scores. However, if this is true, I did not find an explanation. I was looking for a reference on the Mplus website or in a research paper but without sucess. Do you have any recommendations? Thanks! 


The aggregation of the within and between is more robust to model misspecifications. For the individual score I would use the aggregation of within and between. This paper has some discussion on twolevel factor scores http://statmodel.com/download/NCME_revision2.pdf 

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