SORT : Statistics and Operations Research Transactions
SORT (ISSN 1696-2281 / ISSN electrònic 2013-8830) és una publicació semestral d'àmbit internacional coeditada per l'Idescat i quatre universitats catalanes (Universitat Politècnica de Catalunya, Universitat de Barcelona, Universitat Autònoma de Barcelona i Universitat de Girona) i amb la col•laboració de la Regió Espanyola de la Societat Internacional de Biometria. Publicada íntegrament en anglès (amb resums en català), promou la publicació d'articles originals d'estadística aplicada i metodologia estadística, investigació operativa, estadística oficial i biometria, així com la recensió de llibres i altres publicacions en aquests àmbits. SORT es publica des del 2003 i representa la tercera sèrie de Qüestiió (Quaderns d'Estadística i Investigació Operativa), publicada per l'Idescat des del 1992.
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2021-12-18
04:15
20 p, 583.3 KB Exponentiated power Maxwell distribution with quantile regression and applications / Gallardo, Diego (Universidad de Atacama, Copiapó (Xile). Departamento de Matemática) ; Gómez, Yolanda M. (Universidad de Atacama, Copiapó (Xile). Departamento de Matemática) ; Segovia, Francisco A. (Universidad de Atacama, Copiapó (Xile). Departamento de Matemática)
In this paper we introduce an extension of the power Maxwell distribution. We also discuss a reparametrized version of this model applied to quantile regression. Some properties of the model and estimation based on the maximum likelihood estimation method are studied. [...]
2021 - 10.2436/20.8080.02.115
SORT : statistics and operations research transactions, Vol. 45 Núm. 2 (July-December 2021) , p. 181-200 (Articles)  
2021-12-18
04:15
20 p, 572.3 KB Bayesian hierarchical nonlinear modelling of intra-abdominal volume during pneumoperitoneum for laparoscopic surgery / Calvo, Gabriel (Universitat de València. Departament d'Estadística i Investigació Operativa) ; Armero, Carmen (Universitat de València. Departament d'Estadística i Investigació Operativa) ; Gómez-Rubio, Virgilio (Universidad de Castilla-La Mancha. Departamento de Matematicas) ; Mazzinari, Guido (Hospital Universitari i Politècnic La Fe de València)
Laparoscopy is an operation carried out in the abdomen through small incisions with visual control by a camera. This technique needs the abdomen to be insufflated with carbon dioxide to obtain a working space for surgical instruments' manipulation. [...]
2021 - 10.2436/20.8080.02.113
SORT : statistics and operations research transactions, Vol. 45 Núm. 2 (July-December 2021) , p. 143-162 (Articles)  
2021-12-18
04:15
22 p, 1.1 MB Modified almost unbiased two-parameter estimator for the Poisson regression model with an application to accident data / Alheety, Mustafa I. (University of Anbar (Irak). Department of Mathematics,College of Education for Pure Sciences) ; Qasim, Muhammad (Jönköping University (Suècia). Department of Economics, Finance and Statistics) ; Månsson, Kristofer (Jönköping University (Suècia). Department of Economics, Finance and Statistics) ; Kibria, B. M. Golam (Florida International University. Department of Mathematics and Statistics)
Due to the large amount of accidents negatively affecting the wellbeing of the survivors and their families, a substantial amount of research is conducted to determine the causes of road accidents. This type of data come in the form of non-negative integers and may be modelled using the Poisson regression model. [...]
2021 - 10.2436/20.8080.02.112
SORT : statistics and operations research transactions, Vol. 45 Núm. 2 (July-December 2021) , p. 121-142 (Articles)  
2021-12-18
04:15
18 p, 719.2 KB Median bilinear models in presence of extreme values / Santolino, Miguel (Universitat de Barcelona. Departament d'Econometria)
Bilinear regression models involving a nonlinear interaction term are applied in many fields (e. g. , Goodman's RC model, Lee-Carter mortality model or CAPM financial model). In many of these contexts data often exhibit extreme values. [...]
2021 - 10.2436/20.8080.02.114
SORT : statistics and operations research transactions, Vol. 45 Núm. 2 (July-December 2021) , p. 163-180 (Articles)  
2021-12-18
04:15
28 p, 891.5 KB Nonparametric estimation of the probability of default with double smoothing / Peláez, Rebeca (Universidade da Coruña. Departamento de Matemáticas) ; Cao, Ricardo (Universidade da Coruña. Departamento de Matemáticas) ; Vilar, Juan M. (Universidade da Coruña. Departamento de Matemáticas)
In this paper, a general nonparametric estimator of the probability of default is proposed and studied. It is derived from an estimator of the conditional survival function for censored data obtained with a double smoothing, on the covariate and on the variable of interest. [...]
2021 - 10.2436/20.8080.02.111
SORT : statistics and operations research transactions, Vol. 45 Núm. 2 (July-December 2021) , p. 93-120 (Articles)  
2021-06-19
06:29
16 p, 5.3 MB The radiant diagrams of Florence Nightingale / Friendly, Michael ; Andrews, Raymond
This article is a tribute to the contributions of Florence Nightingale to statistics and statistical graphics on her bicentennial. We start with her most famous "rose" diagram and describe how she came to this graphic, designed to influence medical practice in the British army. [...]
2021 - 10.2436/20.8080.02.106
SORT : statistics and operations research transactions, Vol. 45 Núm. 1 (January-June 2021) , p. 3-18 (Articles)  
2021-06-19
06:29
14 p, 437.2 KB Bayesian classification for dating archaeological sites via projectile points / Armero, Carmen ; García-Donato, Gonzalo ; Jimenez-Puerto, Joaquín ; Pardo-Gordó, Salvador ; Bernabeu Auban, Joan
Dating is a key element for archaeologists. We propose a Bayesian approach to provide chronology to sites that have neither radiocarbon dating nor clear stratigraphy and whose only information comes from lithic arrowheads. [...]
2021 - 10.2436/20.8080.02.108
SORT : statistics and operations research transactions, Vol. 45 Núm. 1 (January-June 2021) , p. 33-46 (Articles)  
2021-06-19
06:29
24 p, 385.0 KB The unilateral spatial autogressive process for the regular lattice two-dimensional spatial discrete data / Chutoo, Azmi ; Karlis, Dimitris ; Khan, Naushad Mamode ; Jowaheer, Vandna
This paper proposes a generalized framework to analyze spatial count data under a unilateral regular lattice structure based on thinning type models. We start from the simple spatial integer-valued auto-regressive model of order 1. [...]
2021 - 10.2436/20.8080.02.110
SORT : statistics and operations research transactions, Vol. 45 Núm. 1 (January-June 2021) , p. 67-90 (Articles)  
2021-06-19
06:29
20 p, 395.8 KB Joint outlier detection and variable selection using discrete optimization / Jammal, Mahdi ; Canu, Stephane ; Abdallah, Maher
In regression, the quality of estimators is known to be very sensitive to the presence of spurious variables and outliers. Unfortunately, this is a frequent situation when dealing with real data. To handle outlier proneness and achieve variable selection, we propose a robust method performing the outright rejection of discordant observations together with the selection of relevant variables. [...]
2021 - 10.2436/20.8080.02.109
SORT : statistics and operations research transactions, Vol. 45 Núm. 1 (January-June 2021) , p. 47-66 (Articles)  
2021-06-19
06:29
14 p, 148.9 KB Verifying compliance with ballast water standards : a decision-theoretic approach / Costa, Eliardo G. ; Paulino, Carlos Daniel ; Singer, Julio M
We construct credible intervals to estimate the mean organism (zooplankton and phytoplankton) concentration in ballast water via a decision-theoretic approach. To obtain the required optimal sample size, we use a total cost minimization criterion defined as the sum of the sampling cost and the Bayes risk either under a Poisson or a negative binomial model for organism counts, both with a gamma prior distribution. [...]
2021 - 10.2436/20.8080.02.107
SORT : statistics and operations research transactions, Vol. 45 Núm. 1 (January-June 2021) , p. 19-32 (Articles)