Results overview: Found 18 records in 0.02 seconds.
Articles, 16 records found
Research literature, 2 records found
Articles 16 records found  1 - 10next  jump to record:
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  
2.
22 p, 1.2 MB Fundamentals of convex optimization for compositional data / Saperas Riera, Jordi (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Martín-Fernández, Josep-Antoni (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada y Estadística) ; Mateu-Figueras, Glòria (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada y Estadística)
Many of the most popular statistical techniques incorporate optimisation problems in their inner workings. A convex optimisation problem is defined as the problem of minimising a convex function over a convex set. [...]
2023 - 10.57645/20.8080.02.11
SORT : statistics and operations research transactions, Vol. 47 Núm. 2 (2023) , p. 323-344  
3.
28 p, 2.0 MB Compositional combination and selection of forecasters / Martín Arroyo, Antonio (Universidad Autónoma de Madrid) ; de Juan Fernández, Aránzazu (Universidad Autónoma de Madrid)
The Split-Then-Combine approach has previously been used to generate the weights of forecasts in a combination in the Euclidean space. This paper extends this approach to combine forecasts inside the simplex space, the sample space of positive weights adding up to one. [...]
2022 - 10.2436/20.8080.02.123
SORT : statistics and operations research transactions, Vol. 46 Núm. 2 (2022) , p. 189-216 (Articles)  
4.
4 p, 1.0 MB A case report of isolated primary herpes-simplex virus neuroretinitis in an immunocompetent adult / Lázaro-Rodríguez, Víctor (Universitat Autònoma de Barcelona. Institut Universitari Barraquer) ; Berrada, Halima (Universitat Autònoma de Barcelona. Institut Universitari Barraquer) ; Capella, María José (Universitat Autònoma de Barcelona. Institut Universitari Barraquer)
Herpes simplex virus (specifically HSV-1 and HSV-2) are greatly prevalent viruses that can cause conjunctivitis, keratitis and other rarer ocular disorders such as acute retinal necrosis syndrome or neuroretinitis. [...]
2022 - 10.1186/s12886-022-02272-7
BMC ophthalmology, Vol. 22 (february 2022)  
5.
28 p, 508.5 KB Modelling count data using the logratio-normal-multinomial distribution / Comas-Cufí, Marc (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Martín-Fernández, Josep-Antoni (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Mateu-Figueras, Glòria (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Palarea-Albaladejo, Javier (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística)
The logratio-normal-multinomial distribution is a count data model resulting from compounding a multinomial distribution for the counts with a multivariate logratio-normal distribution for the multinomial event probabilities. [...]
2020 - 10.2436/20.8080.02.96
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 99-126 (Articles)  
6.
16 p, 1.3 MB Automated fitting of X-ray powder diffraction patterns from interstratified phyllosilicates / Yuan, Hongji (Indiana University. Department of Geological Sciences) ; Bish, David L. (Indiana University. Department of Geological Sciences)
NEWMOD, developed by R. C. Reynolds, Jr. , has been an important tool for evaluating quantitatively X-ray diffraction (XRD) patterns from interstratified clay minerals for more than 20 years. However, a significant drawback to the NEWMOD approach is that analyses are done by forward simulation, making results sensitive to user input and starting-model assumptions. [...]
2010 - 10.1346/CCMN.2010.0580601
Clays and Clay Minerals, Vol. 58, Núm. 6 (2010) , p. 727-742  
7.
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)  
8.
26 p, 2.4 MB Log-ratio methods in mixture models for compositional data sets / Comas-Cufí, Marc (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Martín-Fernández, Josep-Antoni (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Mateu-Figueras, Glòria (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística)
When traditional methods are applied to compositional data misleading and incoherent results could be obtained. Finite mixtures of multivariate distributions are becoming increasingly important nowadays. [...]
2016
SORT : statistics and operations research transactions, Vol. 40 Núm. 2 (July-December 2016) , p. 349-374 (Articles)  
9.
22 p, 485.8 KB On the interpretation of differences between groups for compositional data / Martín-Fernández, Josep-Antoni (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada) ; Daunis i Estadella, Josep (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada) ; Mateu-Figueras, Glòria (Universitat de Girona. Departament d'Informàtica i Matemàtica Aplicada)
Social polices are designed using information collected in surveys; such as the Catalan TimeUse survey. Accurate comparisons of time use data among population groups are commonlyanalysed using statistical methods. [...]
2015
SORT : statistics and operations research transactions, Vol. 39 Núm. 2 (July-December 2015) , p. 231-252 (Articles)  
10.
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  

Articles : 16 records found   1 - 10next  jump to record:
Research literature 2 records found  
1.
1 p, 608.8 KB Establishment, maintenance and reactivation from latency of the herpes simplex virus type 1 (HSV-1) / Sáez Fernández, Alba ; Luquín Fernández, M., (Marina) dir. (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia) ; Universitat Autònoma de Barcelona. Facultat de Biociències
2015
Grau en Microbiologia [816]  
2.
1 p, 1.2 MB Alzheimer's disease and microorganisms : is there any common mechanism in the progression of the disease? / Mayorgas Guillamet, Aida ; Luquín Fernández, M., (Marina), dir. (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia) ; Universitat Autònoma de Barcelona. Facultat de Biociències
2014
Grau en Microbiologia [816]  

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