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Anonymous posted on Tuesday, July 24, 2012  9:01 am



I am looking for a guide as to how Mplus calculates 'results in probability scale' having estimated the latent class model. Can you advise? 


The formula is p = 1 / (1 + exp(threshold)) 

Anonymous posted on Tuesday, July 24, 2012  11:41 am



Thank you. And how are the class membership probabilities calculated? 


Mplus prints estimates of [c#1 c#2...]; that is the logits corresponding to the intercepts/means of the multinomial regression on covariates (no covs implies that the intercepts are the means). Then use UG Chapter 14 formulas on pages 441445 to translate from those logits to probabilities. 


To follow up on this question, how does Mplus obtain the SEs for the results in probability scale, following an LCA? As short explanation or reference would be great, thank you. 


Sorry I should have looked into this more closely before posting. It seems that the SEs for the results in probability scale can be obtained using the delta method and the output in TECH3. Thanks, Peter 


Right. 

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