Zero Inflated Possion/Negative Binomial Models

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startz
Non-normality and collinearity are NOT problems!
Posts: 3779
Joined: Wed Sep 17, 2008 2:25 pm

Re: Zero Inflated Possion/Negative Binomial Models

Postby startz » Tue Jan 12, 2021 9:08 am

What is the difference between zero-altered and zero-inflated?

eviewsuser10
Posts: 16
Joined: Thu Oct 15, 2020 3:27 am

Re: Zero Inflated Possion/Negative Binomial Models

Postby eviewsuser10 » Thu Jan 14, 2021 9:03 pm

What is the difference between zero-altered and zero-inflated?
startz, Based on my limited knowledge, both zero-inflated and -altered poisson models have two components: binary and county processes. However, they differ in terms of whether the count model is truncated at zero or not. Zero-inflated poisson models include zeros in both the binary and count processes, while zero-altered poisson models do not incorporate zeros in the count process with zeros being included in the binary process. I hope this is helpful.

startz
Non-normality and collinearity are NOT problems!
Posts: 3779
Joined: Wed Sep 17, 2008 2:25 pm

Re: Zero Inflated Possion/Negative Binomial Models

Postby startz » Fri Jan 15, 2021 7:01 am

Thank you. I didn't know that. By the way, Greene's textbook suggests that under some circumstances the two terms are used interchangeably.)


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