I have run a negative binomial growth model with intercept, slope, quadratic, and cubic growth factors and am estimating the variance of the intercept and slope.
I am trying to plot the expected values in excel (although I understand I can plot within Mplus). I believe that I need to exponentiate the mean growth factors, however I can't replicate the values that Mplus plots.
Although, I can replicate the values, when the variance of all the growth parameters is fixed at 0.
That's right, numerical integration is not needed for continuous outcomes. Numerical integration is needed when you have a combination of continuous latent variables (factors, growth factors, random effects) and observed non-continuous variables (binary, ordinal, nominal, count, censored).