Zero Inflated Possion/Negative Binomial Models
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- Non-normality and collinearity are NOT problems!
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Re: Zero Inflated Possion/Negative Binomial Models
What is the difference between zero-altered and zero-inflated?
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Re: Zero Inflated Possion/Negative Binomial Models
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.What is the difference between zero-altered and zero-inflated?
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- Non-normality and collinearity are NOT problems!
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- Joined: Wed Sep 17, 2008 2:25 pm
Re: Zero Inflated Possion/Negative Binomial Models
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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