i am working on a zero inflated negbin LGM for a count variable over 4 timepoints. A linear growth specification results in a negative mean slope, which fits the observed mean development of the counts. However, the Model Estimated Means reveal a totally different development (from t1 to t4: 2.491, 2.229, 4.093 & 14.779). Residuals are accordingly high. I am unsure how interpret this result. It could be a model misspecification, although nothing seems to point to this. Any thoughts on this? Thanks in advance.
exponentiating these means does not result in reasonable values. Subtracting the residuals from the estimated means results in the observed means. So the initial estimated means do not seem to be log rates.
I would prefer to send you the data and output file for support. Thank you.