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Mplus Discussion > Growth Modeling of Longitudinal Data >
 Julia posted on Wednesday, March 01, 2017 - 12:20 am
I have a question about nested models in the growth modelling.
The linear growth model is nested within the quadratic growth model. So we can compare them with chi-square difference?

What about the latent basis model? Is it nested within the linear growth model? If not, how to compare the fit o the latent basis model and the linear growth model?

Thank you very much in advance.
 Bengt O. Muthen posted on Wednesday, March 01, 2017 - 9:22 am
If the two models differ in terms of variances being zero versus free, then the chi-square difference test is not ok. So if the quadratic model has a free variance for the quadratic term, then you can't test the linear model against the quadratic. I would use BIC. So use that same principle for your latent basis question.
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