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28 p, 436.1 KB

Efficient algorithms for constructing D- and I-optimal exact designs for linear and non-linear models in mixture experiments / Martín Martín, Raúl (Universidad de Castilla-La Mancha) ; García Camacha Gutiérrez, Irene (Universidad de Castilla-La Mancha) ; Torsney, Bernard (University of Glasgow. School of Mathematics & Statistics)
The problem of finding optimal exact designs is more challenging than that of approximate optimal designs. In the present paper, we develop two efficient algorithms to numerically construct exact designs for mixture experiments. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.84
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 163-190 (Articles)

Detailed record -

18 p, 391.2 KB

On the optimism correction of the area under the receiver operating characteristic curve in logistic prediction models / Iparragirre, Amaia (Universidad del País Vasco. Departamento de Matemáticas) ; Barrio Beraza, Irantzu (Universidad del País Vasco. Departamento de Matemáticas) ; Rodríguez-Álvarez, María Xosé (BCAM-Basque Center for Applied Mathematics (Bilbao, País Basc))
When the same data are used to fit a model and estimate its predictive performance, this estimate may be optimistic, and its correction is required. The aim of this work is to compare the behaviour of different methods proposed in the literature when correcting for the optimism of the estimated area under the receiver operating characteristic curve in logistic regression models. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.82
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 145-162 (Articles)

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30 p, 519.8 KB

Automatic regrouping of strata in the goodness-of-fit chi-square test / Núñez-Antón, Vicente (Universidad del País Vasco) ; Pérez-Salamero, Juan Manuel (Universitat de València) ; Regúlez-Castillo, Marta (Universidad del País Vasco) ; Ventura-Marco, Manuel (Universitat de València) ; Vidal-Meliá, Carlos (Universitat de València)
Pearson's chi-square test is widely employed in social and health sciences to analyse categorical data and contingency tables. For the test to be valid, the sample size must be large enough to provide a minimum number of expected elements per category. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.83
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 113-142 (Articles)

Detailed record -

18 p, 437.6 KB

A probabilistic model for explaining the points achieved by a team in football competition : forecasting and regression with applications to the Spanish competition / Gómez-Déniz, Emilio (Universidad de Las Palmas de Gran Canaria) ; Dávila Cárdenes, Nancy (Universidad de Las Palmas de Gran Canaria) ; Pérez Sánchez, José María (Universidad de Las Palmas de Gran Canaria)
In the last decades, a lot of research papers applying statistical methods for analysing sports data have been published. Football, also called soccer, is one of the most popular sports all over the world organised in national championships in a round robin format in which the team reaching the most points at the end of the tournament wins the competition. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.81
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 95-112 (Articles)

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20 p, 564.5 KB

Internalizing negative externalities in vehicle routing problems through green taxes and green tolls / Serrano-Hernández, Adrián (Universidad Pública de Navarra. Departamento de Estadística, Informática y Matemáticas) ; Faulìn, Javier
Road freight transportation includes various internal and external costs that need to be accounted for in the construction of efficient routing plans. Typically, the resulting optimization problem is formulated as a vehicle routing problem in any of its variants. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.80
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 75-94 (Articles)

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24 p, 3.9 MB

Bayesian joint spatio-temporal analysis of multiple diseases / Gómez-Rubio, Virgilio (Universidad de Castilla-La Mancha) ; Palmí-Perales, Francisco (Universidad de Castilla-La Mancha) ; López-Abente, Gonzalo (Instituto de Salud Carlos III) ; Ramis, Rebeca (Instituto de Salud Carlos III) ; Fernández-Navarro, Pablo (Instituto de Salud Carlos III)
In this paper we propose a Bayesian hierarchical spatio-temporal model for the joint analysis of multiple diseases which includes specific and shared spatial and temporal effects. Dependence on shared terms is controlled by disease-specific weights so that their posterior distribution can be used to identify diseases with similar spatial and temporal patterns. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.79
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 51-74 (Articles)

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26 p, 447.4 KB

New L2-type exponentiality tests / Cuparić, Marija (University of Belgrade. Faculty of Mathematics) ; Milosević, Bojana (University of Belgrade. Faculty of Mathematics) ; Obradović, Marko (University of Belgrade. Faculty of Mathematics)
We introduce new consistent and scale-free goodness-of-fit tests for the exponential distribution based on the Puri-Rubin characterization. For the construction of test statistics we employ weighted L2 distance between V-empirical Laplace transforms of random variables that appear in the characterization. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.78
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 25-50 (Articles)

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22 p, 1.8 MB

A simheuristic for routing electric vehicles with limited driving ranges and stochastic travel times / Reyes-Rubiano, Lorena (Universidad Pública de Navarra) ; Ferone, Daniele (Università degli Studi di Milano-Bicocca) ; Juan, Ángel A. (Universitat Oberta de Catalunya) ; Faulin Fajardo, Francisco Javier (Universidad Pública de Navarra)
Green transportation is becoming relevant in the context of smart cities, where the use of electric vehicles represents a promising strategy to support sustainability policies. However the use of electric vehicles shows some drawbacks as well, such as their limited driving-range capacity. [...]
2019 - DOI (Digital Object Identifier)

10.2436/20.8080.02.77
SORT : statistics and operations research transactions, Vol. 43 Núm. 1 (January-June 2019) , p. 3-24 (Articles)

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