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Divulgação de seminário
Prezados colegas,
Dando inÃcio ao Ciclo de Seminários do PPG Estatistica e
Experimentação Agrônomica, ESALQ, USP, temos o prazer de
convidá-los para o seminário:
**Poisson weighted function related to over- and underdispersion **
**Célestin C. Kokonendji**
Université de Pau et des Pays de l’Adour, France
Local: Sala 311, Departamento de Ciências Exatas, ESALQ/USP,
Piracicaba, SP
Data: 09/03/2006
Horário: 16:00 h
Abstract
Consider a weighted Poisson distribution (WPD) having the same mean
than the original Poisson distribution. This talk proves that the
mean value of the weight function with respect to the underlying
Poisson distribution is a logconvex (logconcave) function
if and only if the WPD is overdispersed (underdispersed) relative to
the Poisson distribution.The logconvexity (logconcavity) of the
weight function is only a sufficient condition, and some other
properties are examined. For a comprehensive relation between over-
and underdispersion, we then introduce a notion of duality between
two WPD such that the product of their weight functions is one. Some
illustrative examples are presented and discussed, in particular for
practical weight functions. We conclude by a new approach for
analyzing count data.
Cordiais saudações,
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