Factor Scores as Predictors PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
 Nisha Nayak posted on Sunday, June 15, 2008 - 12:35 pm
I have a piecewise growth model w/3 parameters (i, s1, s2). Want to see whether growth parameters predict a distinct binary outcome (smoking abstinence). I have run 2 ways: a) Using predicted factor scores from growth model output as IV's in a logistic regression in a separate model, b) regressing the binary outcome on int and slope factors within the growth model itself. However, I get diff results.

Can you explain why? I suspect has to do with int/slopes as latent versus observed variables. How would you proceed?
 Linda K. Muthen posted on Monday, June 16, 2008 - 9:50 am
It is always best to do an analysis in one rather than two steps. Also, using factor scores is not the same as using the factors in the model.
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