Data/hora: 09/06/2024 16:36:05

Provedor de dados: | 63
País: | Brazil
Título: | Autologistic model with an application to the citrus "sudden death" disease
Autores: | Krainski,Elias Teixeira; Ribeiro Junior,Paulo Justiniano; Bassanezi,Renato Beozzo; Franciscon,Luziane.
Data: | 2008-01-01
Ano: | 2008
Palavras-chave: | Spatial statistics; Plant disease; Binary response variable; Pseudolikelihood; Bootstrap.
Resumo: | The citrus sudden death (CSD) disease affects dramatically citrus trees causing a progressive plant decline and death. The disease has been identified in the late 90's in the main citrus production area of Brazil and since then there are efforts to understand the etiology as well as the mechanisms its spreading. One relevant aspect of such studies is to investigate spatial patterns of the occurrence within a field. Methods for determining whether the spatial pattern is aggregated or not has been frequently used. However it is possible to further explore and describe the data by means of adopting an explicit model to discriminate and quantify effects by attaching parameters to covariates which represent aspects of interest to be investigated. One alternative involves autologistic models, which extend a usual logistic model in order to accommodate spatial effects. In order to implement such model it is necessary to take into account the reuse of data to built spatial covariates, which requires extensions in methodology and algorithms to assess the variance of the estimates. This work presents an application of the autologistic model to data collected at 11 time points from citrus fields affected by CSD. It is shown how the autologistic model is suitable to investigate diseases of this type, as well as a description of the model and the computational aspects necessary for model fitting.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500014
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162008000500014
Formato: | text/html
Fonte: | Scientia Agricola  v.65 n.5 2008
Fonte: | info:eu-repo/semantics/openAccess