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Hi Dr. Muthen, In example 8.14 of the MPLUS Version 7 user's guide, there is a section in the output (just before the 'results in probability scale' section) which says: Latent Class Pattern 1 1 C2#1 ON X 0.689 0.327 2.106 0.035 C2#2 ON X 1.708 0.630 2.711 0.007 Latent Class Pattern 2 1 C2#1 ON X 1.659 0.863 1.921 0.055 C2#2 ON X 2.353 0.734 3.208 0.001 Latent Class Pattern 3 1 C2#1 ON X 0.522 0.384 1.360 0.174 C2#2 ON X 1.316 0.424 3.101 0.002 My question is: What would be the proper way of interpreting the numbers in the first column? The way I look at it is that, for example, 1.316 would be the effect of the covariate X on the log odds of a participant transitioning to class 2 over class 3 at time 2, given that the participant was in class 3 at time 1. Similarly, for example, 0.689 would be the effect of the covariate X on the log odds of a participant transitioning to class 1 over class 3 at time 2, given that the participant was in class 1 at time 1. 


You should ignore the second digit in Latent Class Pattern xy (y is deleted in Version 8). So, 1.316 is simple the log odds in the regression of c2 on x for c1=3. 


Hi Dr. Muthen, Thank you for the clarification. As I understand, in the above example, we actually have several regression equations estimated. One of which is: c2#1 = intercept + (beta1)c1#1 + (beta2)c1#2 + X + (beta3)(c1#1)*X + (beta4)(c1#2)*X where c2#1 is a binary response variable equal to 1 if a participant is classified in category 1 at the second time point and zero if the participant is classified in category 2 or 3 at the second time point (the example assumes 3 latent classes only per time point), and c1#1 and c1#2 are defined analogously (with class 3 as the reference class). In the above, beta1beta4 are regression coefficients. Thus the output of MPLUS I posted previously actually do NOT include beta3 and beta4, but rather, they are estimates of contrasts  is this correct? If so, how do I obtain beta3 and beta4, and their corresponding standard errors and pvalues? Thank you. 


See Mplus Web Note 13 on our website for different parameterizations. 

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