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 Linda Cillessen posted on Thursday, June 07, 2018 - 7:05 am
I am building autoregressive latent trajectory models. I follow the method of Morin et al, 2011 (The longitudinal interplay of adolescents' self-esteem and body image: a conditional autoregressive latent trajectory analysis), which I think is very helpful.

However, there are two things I do not understand. Firstly, in their syntax (supplementary material), the LCM part specifies BI1@-.4. I know that in ALTs, the first measurement point is treated as predetermined. However, I am not sure about why it is predetermined. Furthermore, I am not sure why the number -.4 is used. Can someone explain what number you should use?

Secondly, in the autoregressive parts of the syntax (supplementary material), BI1; or SE1; is specified, before specifying the autoregressive components with the ON statement. Can someone explain the rational behind specifying this statement is? I am not sure whether I should include it.

Thanks in advance for the replies!
 Bengt O. Muthen posted on Thursday, June 07, 2018 - 4:21 pm
I am not familiar with this model - you want to ask Morin. Feel free to come back with the answer.
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