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şeyma posted on Tuesday, March 11, 2014  8:57 am



Dear Mplus users, 1. I am trying to running example 10.5 monte carlo study. But I want this data include a covariate variable. (for example a gender variable: 600 females in latent class 1, 400 males in latent class 2; 400 females in latent class 2 and 600 males in latent class 1=2000 observations totaly gender splşt is 50% and . How can I add such a variable in this study? 2. Another question is: Which prior paramter used for this simulation study? Can we generate response patterns in this example based on item response model? Because I want to item diffuculties differ between latent classes. Thank you. Şeyma 


First, note that this is an advanced analysis that calls for experience with Mplus Monte Carlo simulations. 1. You add a binary x variable (see UG chapter 11 for how to do that) which influences the latent class variable ("c ON x"). 2. You can use parameter values from a realdata analysis. 

şeyma posted on Tuesday, April 08, 2014  4:34 am



Dear Bengt Muthen, I try to fit my data to the multilevel mixture item response model. For this reason I used example 10.5. I guess the syntax is for 1PL model or Rasch model. I have now class spesicific item diffuculties. I want to use these parameter for differential item functioning detection. But I wonder that these item diffuculties directly comparable? Should I bring the parameters the same scale? Thanks, Şeyma 


Ex 10.5 uses a 2PL model. To have a comparable latent variable scale you need to start with equality of loadings and thresholds across the classes. Then you can free up some of those equalities to capture DIF. 

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