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Mplus Discussion > Growth Modeling of Longitudinal Data >
 GP posted on Wednesday, September 02, 2009 - 4:00 pm
I'm running LCGA with two classes and 6 timepoints with data values ranging from 17 to 92.
The plot of the sample and estimated means shows that these means are far apart at timepoint 1 (about 20 points), but not at later timepoints.
There is no missing data at timepoint 1, while there is afterwards. I'm a little puzzled, and I would like to hear your thoughts.
Thank you in advance.
 Bengt O. Muthen posted on Wednesday, September 02, 2009 - 5:14 pm
Perhaps you use a linear growth model, but should use a quadratic or piecewise model. In some studies, such as with mental health, the first time point often has a much different value than subsequent time points which cannot be well approximated by linear development.
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