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Resultats globals: 7 registres trobats en 0.01 segons.
Articles, 7 registres trobats
Articles 7 registres trobats  
1.
16 p, 406.0 KB Subcompositional coherence and and a novel proportionality index of parts / Egozcue, Juan José (Universidad Politecnica de Catalunya. Departament d'Enginyeria Civil i Ambiental) ; Pawlowsky-Glahn, Vera (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada y Estadística)
Research in compositional data analysis was motivated by spurious (Pearson) correlation. Spurious results are due to semantic incoherence, but the question of ways to relate parts in a statistically consistent way remains open. [...]
2023 - 10.57645/20.8080.02.7
SORT : statistics and operations research transactions, Vol. 47 Núm. 2 (2023) , p. 229-244  
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2.
22 p, 582.0 KB 40 years after Aitchison's article "The statistical analysis of compositional data" : Where we are and where we are heading / Coenders, Germà (Universitat de Girona. Departament d'Economia) ; Egozcue, Juan José (Universidad Politecnica de Catalunya. Departament d'Enginyeria Civil i Ambiental) ; Fačevicová, Kamila (Palacky University Olomouc. Department of Mathematical Analysis and Applications of Mathematics) ; Navarro-López, Carolina (Universitat de les Illes Balears. Departament d'Economia Aplicada) ; Palarea-Albaladejo, Javier (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada y Estadística) ; Pawlowsky-Glahn, Vera (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada y Estadística) ; Tolosana-Delgado, Raimon (Helmholtz-Institute Freiberg for Resource Technology (Freiberg, Alemanya))
The year 2022 marked 40 years since Aitchison published the article "The statistical analysis of compositional data". It is considered to be the foundation of contemporary compositional data analysis. [...]
2023 - 10.57645/20.8080.02.6
SORT : statistics and operations research transactions, Vol. 47 Núm. 2 (2023) , p. 207-228  
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3.
12 p, 401.2 KB Balances : a New Perspective for Microbiome Analysis / Rivera Pinto, Javier (Institut Germans Trias i Pujol. Institut de Recerca de la Sida IrsiCaixa) ; Egozcue, J. J.. (Universitat Politècnica de Catalunya) ; Pawlowsky-Glahn, Vera (Universitat de Girona) ; Paredes, Roger (Universitat Autònoma de Barcelona. Departament de Medicina) ; Noguera-Julian, Marc (Institut Germans Trias i Pujol. Institut de Recerca de la Sida IrsiCaixa) ; Calle, M. Luz (Universitat de Vic - Universitat Central de Catalunya)
We propose a new algorithm for the identification of microbial signatures. These microbial signatures can be used for diagnosis, prognosis, or prediction of therapeutic response based on an individual's specific microbiota. [...]
2018 - 10.1128/mSystems.00053-18
mSystems, Vol. 3 (july 2018)  
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4.
20 p, 216.0 KB On interpretations of tests and effect sizes in regression models with a compositional predictor / Coenders, Germà (Universitat de Girona. Departament d'Economia) ; Pawlowsky-Glahn, Vera (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística)
Compositional data analysis is concerned with the relative importance of positive variables, expressed through their log-ratios. The literature has proposed a range of manners to compute log-ratios, some of whose interrelationships have never been reported when used as explanatory variables in regression models. [...]
2020 - 10.2436/20.8080.02.100
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 201-220 (Articles)  
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5.
24 p, 432.6 KB Evidence functions : a compositional approach to information / Egozcue, J. J.. (Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental) ; Pawlowsky-Glahn, Vera (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada)
The discrete case of Bayes' formula is considered the paradigm of information acquisition. Prior and posterior probability functions, as well as likelihood functions, called evidence functions, are compositions following the Aitchison geometry of the simplex, and have thus vector character. [...]
2018 - 10.2436/20.8080.02.71
SORT : statistics and operations research transactions, Vol. 42 Núm. 2 (July-December 2018) , p. 101-124 (Invited articles)  
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6.
28 p, 389.4 KB The normal distribution in some constrained sample spaces / Mateu-Figueras, Glòria (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada) ; Pawlowsky-Glahn, Vera (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada) ; Egozcue, J. J.. (Universitat Politècnica de Catalunya. Departament de Matemàtica Aplicada III)
Phenomena with a constrained sample space appear frequently in practice. This is the case, for example, with strictly positive data, or with compositional data, such as percentages or proportions. If the natural measure of difference is not the absolute one, simple algebraic properties show that it is more convenient to work with a geometry different from the usual Euclidean geometry in real space, and with a measure different from the usual Lebesgue measure, leading to alternative models that better fit the phenomenon under study. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 1 (January-June 2013) , p. 29-56  
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7.
22 p, 156.6 KB Bayes linear spaces / Van Den Boogart, Karl-Gerald ; Egozcue, J. J.. ; Pawlowsky-Glahn, Vera
Linear spaces consisting of o-finite probability measures and infinite measures (improper priors and likelihood functions) are defined. The commutative group operation, called perturbation, is the updating given by Bayes theorem; the inverse operation is the Radon-Nikodym derivative. [...]
2010
SORT : statistics and operations research transactions, Vol. 34, Núm. 2 (July-December 2010) , p. 201-222  
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