SORT : Statistics and Operations Research Transactions
SORT (ISSN 1696-2281 / ISSN electrònic 2013-8830) is an international biannual publication jointly published by Idescat and fours catalan universities (Universitat Politècnica de Catalunya, Universitat de Barcelona, Universitat Autònoma de Barcelona i Universitat de Girona) and with the collaboration of Regió Espanyola de la Societat Internacional de Biometria. Fully published in English (with abstracts in Catalan) promotes the publication of original articles on statistical methodology and applied statistics, operations research, official statistics and biometrics, as well as reviews of books and other publications in this field. SORT is published since 2003 and represents the third part of Qüestió (Quaderns d'Estadística i Investigació Operativa), published by Idescat since 1992.
Usage statistics Most popular
Latest additions:
2020-06-27
05:07
20 p, 216.0 KB On interpretations of tests and effect sizes in regression models with a compositional predictor / Coenders Gallart, 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)  
2020-06-27
05:07
30 p, 262.9 KB Bayesian structured antedependence model proposals for longitudinal data / Castillo-Carreno, Edwin (Universidad Nacional de Colombia. Departamento de Estadística) ; Cepeda-Cuervo, Edilberto (Universidad Nacional de Colombia. Departamento de Estadística) ; Núñez-Antón, Vicente. (Universidad del País Vasco. Departamento de Economía Aplicada III (Econometría y Estadística))
An important problem in Statistics is the study of longitudinal data taking into account the effect of other explanatory variables, such as treatments and time and, simultaneously, the incorporation into the model of the time dependence between observations on the same individual. [...]
2020 - 10.2436/20.8080.02.99
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 171-200 (Articles)  
2020-06-27
05:07
30 p, 659.2 KB Green hybrid fleets using electric vehicles : solving the heterogeneous vehicle routing problem with multiple driving ranges and loading capacities / Hatami, Sara (Universitat Oberta de Catalunya. Internet Interdisciplinary Institute (IN3)) ; Eskandarpour, Majid (Université de Lille. ESEG School of Management) ; Chica, Manuel (Universidad de Granada) ; Juan, Ángel A. (Universitat Oberta de Catalunya. Internet Interdisciplinary Institute (IN3)) ; Ouelhadj, Djamila (University of Portsmouth. School of Math and Physics)
The introduction of Electric Vehicles (EVs) in modern fleets facilitates green road transportation. However, the driving ranges of EVs are limited by the duration of their batteries, which arise new operational challenges. [...]
2020 - 10.2436/20.8080.02.98
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 141-170 (Articles)  
2020-06-27
05:07
14 p, 144.9 KB Bartlett and Bartlett-type corrections for censored data from a Weibull distribution / Magalhães, Tiago M. (Universidade Federal de Juiz de Fora. Department of Statistics, Institute of Exact Sciences) ; Gallardo, Diego I. (Universidad de Atacama (Copiapó, Xile). Departamento de Matemáticas)
In this paper, we obtain the Bartlett factor for the likelihood ratio statistic and the Bartlett-type correction factor for the score and gradient test in censored data from a Weibull distribution. The expressions derived are simple, we only have to define a few matrices. [...]
2020 - 10.2436/20.8080.02.97
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 127-140 (Articles)  
2020-06-27
05:07
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)  
2020-06-27
05:07
32 p, 463.2 KB Integer constraints for enhancing interpretability in linear regression / Carrizosa Priego, Emilio (Universidad de Sevilla. Departamento de Estadística e Investigación Operativa) ; Olivares-Nadal, Alba V. (The University of Chicago Booth School of Business) ; Ramírez-Cobo, Pepa (Universidad de Cádiz. Departamento de Estadística e Investigación Operativa)
One of the main challenges researchers face is to identify the most relevant features in a prediction model. As a consequence, many regularized methods seeking sparsity have flourished. Although sparse, their solutions may not be interpretable in the presence of spurious coefficients and correlated features. [...]
2020 - 10.2436/20.8080.02.95
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 67-98 (Articles)  
2020-06-27
05:07
28 p, 575.4 KB Finding archetypal patterns for binary questionnaires / Cabero Fayos, Ismael (Universidad Internacional de La Rioja. Departamento de Didáctica de las Matemáticas) ; Epifanio López, Irene (Universitat Jaume I de Castelló. Departament de Matemàtiques)
Archetypal analysis is an exploratory tool that explains a set of observations as mixtures of pure (extreme) patterns. If the patterns are actual observations of the sample, we refer to them as archetypoids. [...]
2020 - 10.2436/20.8080.02.94
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 39-66 (Articles)  
2020-06-27
05:07
36 p, 514.8 KB Small area estimation of additive parameters under unit-level generalized linear mixed models / Hobza, Tomáš (Czech Technical University in Prague. Department of Mathematics) ; Marhuenda García, Yolanda (Universidad Miguel Hernández. Instituto Centro de Investigación Operativa) ; Morales González, Domingo (Universidad Miguel Hernández. Instituto Centro de Investigación Operativa)
Average incomes and poverty proportions are additive parameters obtained as averages of a given function of an income variable. As the variable income has an asymmetric distribution, it is not properly modelled via normal distributions. [...]
2020 - 10.2436/20.8080.02.93
SORT : statistics and operations research transactions, Vol. 44 Núm. 1 (January-June 2020) , p. 3-38 (Articles)  
2020-04-06
13:19
8 p, 183.4 KB Contribuciones de Albert Prat a la Estadística Industrial y la Calidad / Peña Sánchez de Rivera, Daniel (Universidad Carlos III de Madrid)
2006
SORT : statistics and operations research transactions, Special issue. Albert Prat in memoriam (April 2006) (Albert Prat i l'estadística)  
2020-04-06
13:15
5 p, 47.0 KB Albert Prat and Computational Statistics : working with Albert / Ford, Brian
2006
SORT : statistics and operations research transactions, Special issue. Albert Prat in memoriam (April 2006) (Albert Prat i l'estadística)