Meaning of the λ parameter of skew–normal and log–skew normal distributions in fluid geochemistry
dc.contributor.author
dc.contributor.editor
dc.date.accessioned
2008-05-06T09:28:45Z
dc.date.available
2008-05-06T09:28:45Z
dc.date.issued
2005-10
dc.identifier.citation
Buccianti, A. 'Meaning of the λ parameter of skew–normal and log–skew normal distributions in fluid geochemistry' a CODAWORK’05. Girona: La Universitat, 2005 [consulta: 6 maig 2008]. Necessita Adobe Acrobat. Disponible a Internet a: http://hdl.handle.net/10256/685
dc.identifier.isbn
84-8458-222-1
dc.identifier.uri
dc.description.abstract
The literature related to skew–normal distributions has grown rapidly in recent years
but at the moment few applications concern the description of natural phenomena with
this type of probability models, as well as the interpretation of their parameters. The
skew–normal distributions family represents an extension of the normal family to which
a parameter (λ) has been added to regulate the skewness. The development of this theoretical
field has followed the general tendency in Statistics towards more flexible methods
to represent features of the data, as adequately as possible, and to reduce unrealistic
assumptions as the normality that underlies most methods of univariate and multivariate
analysis. In this paper an investigation on the shape of the frequency distribution of the
logratio ln(Cl−/Na+) whose components are related to waters composition for 26 wells,
has been performed. Samples have been collected around the active center of Vulcano
island (Aeolian archipelago, southern Italy) from 1977 up to now at time intervals of
about six months. Data of the logratio have been tentatively modeled by evaluating the
performance of the skew–normal model for each well. Values of the λ parameter have
been compared by considering temperature and spatial position of the sampling points.
Preliminary results indicate that changes in λ values can be related to the nature of
environmental processes affecting the data
dc.description.sponsorship
Geologische Vereinigung; Institut d’Estadística de Catalunya; International Association for Mathematical Geology; Patronat de l’Escola Politècnica Superior de la Universitat de Girona; Fundació privada: Girona, Universitat i Futur; Càtedra Lluís Santaló d’Aplicacions de la Matemàtica; Consell Social de la Universitat de Girona; Ministerio de Ciencia i Tecnología.cat
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
Meaning of the λ parameter of skew–normal and log–skew normal distributions in fluid geochemistry
dc.type
info:eu-repo/semantics/conferenceObject
dc.rights.accessRights
info:eu-repo/semantics/openAccess