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| Plotting a count (negative binomial) ... |
 
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Hello,
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.
Any help would be greater appreciated.
Thanks |
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| The variances of the growth factor means that you need to use numerical integration over the growth factors to get the estimated values - you cannot just plug in the growth factor means. |
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Thank you very much for the quick response.
Following this, is numerical integration not used in growth models which specify the data as continuous?
I ask this because I am able to replicate the expected values in a continuous model with estimated growth parameter variances.
Thanks again for clearing this up. |
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| 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). |
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| Thanks again for clarifying this. |
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