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I am currently looking at a two timepoint LTA with a 4 category latent varriable at each timepoint. Thus there would be 16 possible transition groups (4x4). I am looking to use these transition groups to predict my outcome of suicide attempts (dichotomous). Thus my model would look something like this: %overall% x2 on x1; %x1#1.x2#1 [outcome$1]; %x1#1.x2#2 [outcome$1]; %x1#1.x2#3 [outcome$1]; %x1#1.x2#4 [outcome$1]; ... %x1#4.x2#4 [outcome$1]; My question pertains to setting up a reference group. I would like to calculate the odds ratios for each transition group relative to this transition group: %x1#1.x2#1 [outcome$1]; Is this possible in Mplus? 


Give parameter labels for each of the thresholds of [outcome$1]. Then use the Model Constraint command to express  the probabilities of the outcome as function of the thresholds (see logit regression in UG chapter 14)  the odds ratios as functions of the probabilities. 

Dylan John posted on Thursday, August 31, 2017  9:36 am



Thanks for getting back to me. Are you saying that I want to add a parameter label to each of the 16 transition groups (a1a16). Then in the logit regression statements I will specify the reference group as "a1"? 


Yes, one label for each of the 16. Then follow the style of e.g. slides 4950 of short course Topic 6 on our website. 


Thank you! 

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