Zero-Truncated Poisson PreviousNext
Mplus Discussion > Multilevel Data/Complex Sample >
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 Scott Baldwin posted on Wednesday, February 22, 2012 - 3:48 pm
I am interested in a fitting a model with a count outcome using a zero-truncated poisson model.

The following discussion board postings seem to indicate that zero-truncated poisson is available:

- http://www.statmodel.com/discussion/messages/11/2675.html?1318823019 (see the Oct 16, 2011 posting by Bengt Muthen)
- http://www.statmodel.com/discussion/messages/23/6763.html?1311444916 (see the Feb 17, 2011 posting by Bengt Muthen as well as the July 23, 2011)

However, I've looked through the user manual and it doesn't seem to be an option. The truncated negative-binomial seems to the only option available for a zero-truncated count model. Is that correct? Have I overlooked something?

I'm using Mplus 6.12. Thanks for your help.

Best,
Scott
 Linda K. Muthen posted on Wednesday, February 22, 2012 - 4:35 pm
I agree that the only zero-truncated model is the zero-truncated negative binomial model.
 Bengt O. Muthen posted on Wednesday, February 22, 2012 - 4:49 pm
You can fix the alpha dispersion parameter of negbin to a small value to approximate Poisson. Like 0.01.
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