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 Cherry Chu posted on Tuesday, November 28, 2017 - 9:51 am

I am running a two-part LCGA and I was just wondering what Mplus does with the zeros when sorting the classes? Do the zeros get dropped or are they incorporated into the classes?

Thank you.
 Cherry Chu posted on Tuesday, November 28, 2017 - 10:41 am
Sorry I have one more related question - 1/3 of my sample have zero values for all timepoints. Will Mplus identify a zero class or do I have to do that myself?
 Bengt O. Muthen posted on Tuesday, November 28, 2017 - 2:52 pm
Zeros don't get dropped but become part of a class. You can specify a zero class but if you don't specify such a class, often the subjects who have all zeroes fall in the same class as those who have a few non-zeros and get a better BIC than using a zero class - that is, they are similar to those that have a few non-zeros.
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