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A Score Test for Zero Inflation in a Poisson Distribution

1995; Oxford University Press; Volume: 51; Issue: 2 Linguagem: Inglês

10.2307/2532959

1541-0420

J. van den Broek,

Statistical Methods and Inference

When 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.