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A Score Test for Zero Inflation in a Poisson Distribution
Biometrics, 1995When analyzing Poisson-count data sometimes a lot of zeros are observed. When there are too many zeros a zero-inflated Poisson distribution can be used. A score test is presented to test whether the number of zeros is too large for a Poisson distribution to fit the data well.
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Biometrics, 2001
Summary. Count data often show a higher incidence of zero counts than would be expected if the data were Poisson distributed. Zero‐inflated Poisson regression models are a useful class of models for such data, but parameter estimates may be seriously biased if the nonzero counts are overdispersed in relation to the Poisson distribution.
Ridout, Martin +2 more
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Summary. Count data often show a higher incidence of zero counts than would be expected if the data were Poisson distributed. Zero‐inflated Poisson regression models are a useful class of models for such data, but parameter estimates may be seriously biased if the nonzero counts are overdispersed in relation to the Poisson distribution.
Ridout, Martin +2 more
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Zero Is Not the Optimal Rate of Inflation
Challenge, 1998Alan Greenspan recently stated that the law of supply and demand has not been repealed, arguing that increased inflation is inevitable if the economy continues on its current course. Behind this reference lies a belief in a natural rate of unemployment, itself determined by supply and demand in the labor market.
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Zero-Truncated and Zero-Inflated Models for Count Data
2009In this chapter, we discuss models for zero-truncated and zero-inflated count data. Zero truncated means the response variable cannot have a value of 0. A typical example from the medical literature is the duration patients are in hospital. For ecological data, think of response variables like the time a whale is at the surface before re-submerging ...
Alain F. Zuur +4 more
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A parsimonious model for zero inflation at the zero lower bound
Economics LetterszbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yuta Takahashi, Naoki Takayama
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Estimation of Zero-Inflation Parameter in Zero-Inflated Poisson Model
International Journal of Mathematics Trends and Technology, 2018K.M.Sakthi vel, C.S.Raji tha
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Spatial correlated incidence modeling with zero inflation
Biometrical Journal, 2023Feifei Wang, Yang Li
exaly
Zero-Inflated, Zero-Altered and Positive Discrete Distributions
2015This chapter looks at positive (0-truncated), zero-inflated and zero-altered (hurdle) distributions, with the focus on discrete distributions. Zero-deflated distributions are also mentioned. Specific examples include the zero-inflated Poisson and positive-binomial distributions.
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Modelling counts with state-dependent zero inflation
Statistical Modelling, 2020Tobias A Möller +2 more
exaly