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ZIP GMM with 1 zero class |
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Eric Wan posted on Sunday, June 01, 2014 - 7:10 pm
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Hello, I would like ask a few questions about the growth mixture with zero-inflated Poisson model and set a zero class. (1) According to the paper (Kreuter 2007), the zero class setting in Mplus is shown as below, %c#3% ! zero class throughout [i-q@0]; [ii-qi@0]; i@0; [cage10-cage30@-15]; [cage10#1-cage30#1@-15]; Why do the intercepts set to be “-15”? Moreover, can we set the class that the score <5 instead of zero class? (2) In Mplus, can we set the minimum sample size for each class? For example, at least 5% of the total sample is classified in each class. If not, can we set the priority for splitting new class group? For example, there are two class which class 1 and 2 have 2000 and 100 respectively. However, Mplus sometimes split class 2 instead of class 1 when classifying 3 classes analysis. So, can we set the priority to split class 1 instead of class 2 in Mplus? Thank you very much. |
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(1) Q1. -15 refers to a very low logit value which corresponds to a probability close to zero. Q2. I would not recommend trying this unless you are already and expert mixture modeler. Also, 5 is a high value when it comes to counts. (2) Q1. No - and I don't think you want to. Q2-Q3. No. Mplus chooses classes that produce the highest loglikelihood; it doesn't split classes even though it might sometimes look like it. |
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