<b>A study of the score test in discrimination poisson and zero-inflated poisson models</b> - doi: 10.4025/actascitechnol.v35i2.15071

Autores

  • Vanessa Siqueira Peres da Silva Universidade Federal de Lavras
  • Marcelo Angelo Cirillo Universidade Federal de Lavras
  • Juliana Garcia Cespedes Universidade Federal de São Paulo

DOI:

https://doi.org/10.4025/actascitechnol.v35i2.15071

Palavras-chave:

zero-inflated Poisson, score test, Monte Carlo simulation

Resumo

In many experimental situations the sample may present excess zero observations and generally are used probabilistic models for zero inflated to represent them. However no one knows precisely the amount of zero observations that these models support. Depending on the sample size and null observations number the Poisson model can be used. Based on this question, the objective of this paper is to evaluate the properties of Type I error and power of the score test (proposed by Van Den Broek (1995) to discriminate the Poisson and Zero-inflated Poisson models) and ascertain the most appropriate model to represent a sample with excess zeros without compromising the statistical inference. Through Monte Carlo simulation we concluded that when considering a sample of size at least n = 40 with 30% of the null observations, the score test had a high discriminatory power between the ZIP and Poisson model indicating that in fact is relevant  the use of the ZIP model.

 

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Biografia do Autor

Vanessa Siqueira Peres da Silva, Universidade Federal de Lavras

Departamento de Ciências Exatas, doutoranda em Estatí­stica e Experimentação Agropecuária

Marcelo Angelo Cirillo, Universidade Federal de Lavras

Prof. Adjunto ní­vel III - Departamento de Ciências Exatas - Universidade Federal de Lavras

Juliana Garcia Cespedes, Universidade Federal de São Paulo

Prof. Adjunto, Departamento de Ciência e Tecnologia, área: estatí­stica

Publicado

2012-12-20

Como Citar

Silva, V. S. P. da, Cirillo, M. A., & Cespedes, J. G. (2012). <b>A study of the score test in discrimination poisson and zero-inflated poisson models</b> - doi: 10.4025/actascitechnol.v35i2.15071. Acta Scientiarum. Technology, 35(2), 333–337. https://doi.org/10.4025/actascitechnol.v35i2.15071

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0.8
2019CiteScore
 
 
36th percentile
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0.8
2019CiteScore
 
 
36th percentile
Powered by  Scopus

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