

Multiple group LCA with count& ordina... 

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Good morning Drs. Muthén and thank you for your excellent work. I’m hoping you could help me understand how to take my understanding of Multiple Group Analysis for factor analysis to the same for a categorical LV modeled with an ordinal group indicator (age, 5 categories), 9 count variables (024) and 14 categorical (05) indicators. So far I have thought to model with each member of the group (age) separately using the syntax below(for the first age category, age1), planning to constrain parameters for subsequent models (ages25). However, I wonder if the GROUPING option might be more appropriate? In that case I’m not sure what I would constrain for the count variables—means & variances? Would these be done in separate models, e.g. modeling age1, then age2, etc?? Also, which output would be best? Thank you in advance for your help. Variable: Names are yr school class ord1ord15 educ count1count9 age1; Usevar are ord1ord15 count1count9 age1; Categorical are ord1ord15 age1; Count are count1count9; classes are pg(2); Analysis: TYPE = MIXTURE; STARTS 100 20; 


With TYPE=MIXTURE, the GROUPING option is not available. You should use the KNOWNCLASS option which accomplishes the same thing. When all classes are known, it is the same as multiple group analysis. 


Thank you for your response. I did try KNOWNCLASS and got the error message that since I have missing on the grouping variable, that is not an option. I saw from another post that you had recommended "run the model with the factors and variables shared by all groups and test invariance of the factors over groups for those factors. Then you would have to run the group separately that has more factors and variables", which I'm thinking means what I planned originally. But as I try that I get a model that runs for 1.5 hrs with 2 messages about perturbed starting values not converging, and a message about "AN INSUFFICIENT NUMBER OF E STEPS. INCREASE THE NUMBER OF MITERATIONS." MPlus then added a MODEL statement using final estimates as starting values. Given that the threeclass model for grouping category one won't even converge, what do you recommend next? Thank you again. 


I'm so sorry; I should absolutely add that I omitted Missing are all (9999) ; from my original postbut not the model syntaxto save space in my extralong posting 


Neither GROUPING or KNOWNCLASS can have missing values. You should sort that problem out and use the KNOWNCLASS option. 

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