2 questions regarding LCA PreviousNext
Mplus Discussion > Latent Variable Mixture Modeling >
 Rongjin Guan posted on Wednesday, October 21, 2015 - 11:49 am
I have two general questions regarding running LCA:

1. I have a warning message and wonder if this needs to be addressed:

*** WARNING in MODEL command
All variables are uncorrelated with all other variables within class.
Check that this is what is intended.

2. I have a survey data, with >120 items (questions). Answers are 1-6 likert style. I used EFA and CFA to reduce the number of items to 48, which belong to 9 subscales.
Now I want to run LCA with these 9 subscales, shall I use the sum of the items or the mean of the items within the subscale as input to LCA?

I tried with Sum of items and also mean of items, and the results are different.
So I am wondering which one is the correct practice.

Thank you very much
Rongjin Guan
 Bengt O. Muthen posted on Wednesday, October 21, 2015 - 3:43 pm
1) Harmless.

2) This should not matter, but using a mean keeps the variance lower which can be helpful. You should check your analysis carefully to see why you get a difference, e.g. check that you have the same sample size and that the best logL is replicated.
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