Bayesian tools for zero counts in compositional data
dc.contributor.author
dc.contributor.editor
dc.date.accessioned
2008-05-12T09:26:05Z
dc.date.available
2008-05-12T09:26:05Z
dc.date.issued
2008-05-27
dc.identifier.citation
Daunis i Estadella, J.; Martín 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
dc.identifier.uri
dc.description.abstract
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
dc.description.sponsorship
Geologische Vereinigung; Institut d’Estadística de Catalunya; International Association for Mathematical Geology; Càtedra Lluís Santaló d’Aplicacions de la Matemàtica; Generalitat de Catalunya, Departament d’Innovació, Universitats i Recerca; Ministerio de Educación y Ciencia; Ingenio 2010.
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Universitat de Girona. Departament d’Informàtica i Matemàtica Aplicada
dc.rights
Tots els drets reservats
dc.subject
dc.title
Bayesian tools for zero counts in compositional data
dc.type
info:eu-repo/semantics/conferenceObject
dc.rights.accessRights
info:eu-repo/semantics/openAccess