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Daunis i Estadella, Josep
MartÃn Fernández, Josep Antoni |
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Universitat de Girona. Departament d’Informà tica i Matemà tica Aplicada | |
Daunis i Estadella, Josep
MartÃn Fernández, Josep Antoni Palarea Albaladejo, Javier |
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2008 May 27 | |
The log-ratio methodology makes available powerful tools for analyzing compositional
data. Nevertheless, the use of this methodology is only possible for those data sets
without null values. Consequently, in those data sets where the zeros are present, a
previous treatment becomes necessary. Last advances in the treatment of compositional
zeros have been centered especially in the zeros of structural nature and in the rounded
zeros. These tools do not contemplate the particular case of count compositional data
sets with null values. In this work we deal with \count zeros" and we introduce a
treatment based on a mixed Bayesian-multiplicative estimation. We use the Dirichlet
probability distribution as a prior and we estimate the posterior probabilities. Then we
apply a multiplicative modi¯cation for the non-zero values. We present a case study
where this new methodology is applied.
Key words: count data, multiplicative replacement, composition, log-ratio analysis Geologische Vereinigung; Institut d’EstadÃstica de Catalunya; International Association for Mathematical Geology; Cà tedra LluÃs Santaló d’Aplicacions de la Matemà tica; Generalitat de Catalunya, Departament d’Innovació, Universitats i Recerca; Ministerio de Educación y Ciencia; Ingenio 2010. |
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application/pdf | |
Daunis i Estadella, J.; MartÃn Fernández, J.A.; Palarea Albaladejo, J. ’Bayesian tools for zero counts in compositional data’ a CODAWORK’08. Girona: La Universitat, 2008 [consulta: 12 maig 2008]. Necessita Adobe Acrobat. Disponible a Internet a: http://hdl.handle.net/10256/713 | |
http://hdl.handle.net/10256/713 | |
eng | |
Universitat de Girona. Departament d’Informà tica i Matemà tica Aplicada | |
Tots els drets reservats | |
EstadÃstica bayesiana
Dirichlet, Sèries de |
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Bayesian tools for zero counts in compositional data | |
info:eu-repo/semantics/conferenceObject | |
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