SORT

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SORT	Encontrados 6 registros	La búsqueda tardó 0.01 segundos.

16 p, 204.7 KB

Improved entropy based test of uniformity using ranked set samples / Mahdizadeh, Mahdi ; Arghami, Nasser Reza (Ferdowsi University of Mashhad. Department of Statistics, School of Mathematical Sciences)
Ranked set sampling (RSS) is known to be superior to the traditional simple random sampling (SRS) in the sense that it often leads to more efficient inference procedures. Basic version of RSS has been extensively modified to come up with schemes resulting in more accurate estimators of the population attributes. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 1 (January-June 2013) , p. 3-18

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10 p, 158.9 KB

A note on the Fisher information matrix for the skew-generalized-normal model / Arellano-Valle, Reinaldo B. (Pontificia Universidad Católica de Chile. Departamento de Estadística) ; Gómez, Héctor W. (Universidad de Antofagasta (Chile). Departamento de Matemáticas) ; Salinas, Hugo S. (Universidad de Atacama (Chile). Departamento de Matemática)
In this paper, the exact form of the Fisher information matrix for the skew-generalized normal (SGN) distribution is determined. The existence of singularity problems of this matrix for the skewnormal and normal particular cases is investigated. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 1 (January-June 2013) , p. 19-28

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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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22 p, 3.5 MB

New insights into evaluation of regression models through a decomposition of the prediction errors : application to near-infrared spectral data / Sánchez Rodríguez, María Isabel (Universidad de Córdoba. Departamento de Estadística, Econometría, Investigación Operativa, Organización de Empresas y Economía Aplicada) ; Sánchez López, Elena (Universidad de Córdoba. Departamento de Química Orgánica) ; Caridad, José Mª (Universidad de Córdoba. Departamento de Estadística, Econometría, Investigación Operativa, Organización de Empresas y Economía Aplicada) ; Marinas, Alberto (Universidad de Córdoba. Departamento de Química Orgánica) ; Marinas, Jose Mª (Universidad de Córdoba. Departamento de Química Orgánica) ; Urbano, Francisco José (Universidad de Córdoba. Departamento de Química Orgánica)
This paper analyzes the performance of linear regression models taking into account usual criteria such as the number of principal components or latent factors, the goodness of fit or the predictive capability. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 1 (January-June 2013) , p. 57-78

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14 p, 1.6 MB

Flexible quantile regression models : application to the study of the purple sea urchin / Martínez-Silva, Isabel (Universidade de Santiago de Compostela. Departamento de Estatística) ; Roca-Pardiñas, Javier (Universidade de Vigo. Departamento de Estatística e Investigación Operativa) ; Lustres-Pérez, Vicente (Universidade de Santiago de Compostela. Departamento de Zooloxía e Antropoloxía Física) ; Lorenzo-Arribas, Altea (Universidade de Santiago de Compostela. Departamento de Estatística) ; Cadarso-Suárez, Carmen (Universidade de Santiago de Compostela. Departamento de Estatística)
In many applications, it is often of interest to assess the possible relationships between covariates and quantiles of a response variable through a regression model. In some instances, the effects of continuous covariates on the outcome are highly nonlinear. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 1 (January-June 2013) , p. 81-94

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12 p, 1.3 MB

Modelling "calçots" (Allium cepa L.) growth by Gompertz function / Simó, Joan (Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia) ; Casañas, Francesc (Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia) ; Sabaté, Jose (Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia)
"Calçots" are the second-year resprouts of the "Ceba Blanca Tardana de Lleida" landrace of onions. The evolution of three "calçots" populations has been modeled to help farmers to plan the optimal time to harvest. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 1 (January-June 2013) , p. 95-106

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