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.
Latest additions:
2014-06-30
14:58

14 p, 133.9 KB
Testing extreme value copulas to estimate the quantile / Bahraoui, Zuhair (Universitat de Barcelona) ; Bolance, Catalina (Universitat de Barcelona) ; Pérez-Marín, Ana M. (Universitat de Barcelona)
We generalize the test proposed by Kojadinovic, Segers and Yan which is used for testing whether the data belongs to the family of extreme value copulas. We prove that the generalized test can be applied whatever the alternative hypothesis. [...]
2014
SORT : statistics and operations research transactions, Vol. 38, Núm. 1 (January-June 2014) , p. 89-102  ;
 Accés restringit a la UAB
2014-06-30
14:46

20 p, 337.3 KB
Decision making in kidney paired donation programs with altruistic donors / Li, Yijiang (Google Inc) ; Song, Peter X. -K. (University of Michigan. Department of Biostatistics) ; Leichtman, Alan B. (University of Michigan. Department of Internal Medicine) ; Rees, Michael A. (University of Toledo Medical Center (Toledo, Estats Units d'Amèrica)) ; Kalbfleisch, John D. (University of Michigan. Department of Biostatistics)
In recent years, kidney paired donation has been extended to include living non-directed or altruistic donors, in which an altruistic donor donates to the candidate of an incompatible donorcandidate pair with the understanding that the donor in that pair will further donate to the candidate of a second pair, and so on; such a process continues and thus forms an altruistic donor-initiated chain. [...]
2014
SORT : statistics and operations research transactions, Vol. 38, Núm. 1 (January-June 2014) , p. 53-72  ;
 Accés restringit a la UAB
2014-06-30
14:37

10 p, 107.8 KB
Regression analysis using order statistics and their concomitants / Rasoul Ziaei, Abdul (Islamic Azad University) ; Sheikhi, Ayyub (Shahid Bahonar University. Department of Statistics (Kerman, Iran)) ; Amirzadeh, Vahid (Shahid Bahonar University. Department of Statistics (Kerman, Iran))
In this work we derive the exact joint distribution of linear combinations of order statistics and linear combinations of their concomitants and some auxiliary variables in multivariate normal distribution. [...]
2014
SORT : statistics and operations research transactions, Vol. 38, Núm. 1 (January-June 2014) , p. 43-52  ;
 Accés restringit a la UAB
2014-06-30
14:30

30 p, 1.7 MB
Time-varying market beta : does the estimation methodology matter? / Nieto, Belén (Universidad de Alicante) ; Orbe, Susan (Universidad del País Vasco) ; Zarraga, Ainhoa (Universidad del País Vasco)
This paper compares the performance of nine time-varying beta estimates taken from three different methodologies never previously compared: least-square estimators including nonparametric weights, GARCH-based estimators and Kalman filter estimators. [...]
2014
SORT : statistics and operations research transactions, Vol. 38, Núm. 1 (January-June 2014) , p. 13-42  ;
 Accés restringit a la UAB
2014-06-30
14:22

10 p, 110.7 KB
Improving parametric Clarke and Wright algorithms by means of iterative empirically adjusted greedy heuristics / Corominas, Albert (Institute of Industrial and Control Engineering (Barcelona, Catalunya)) ; García-Villoria, Alberto (Institute of Industrial and Control Engineering (Barcelona, Catalunya)) ; Rafael Pastor, Rafael (Institute of Industrial and Control Engineering (Barcelona, Catalunya))
Since Clarke and Wright proposed their well-known savings algorithm for solving the Capacitated Vehicle Routing Problem, several enhancements to the original savings formula have been recently proposed, in the form of parameterisations. [...]
2014
SORT : statistics and operations research transactions, Vol. 38, Núm. 1 (January-June 2014) , p. 3-12  ;
 Accés restringit a la UAB
2014-06-30
14:06

1 p, 26.4 KB
Editor’s Report 2014 / Guillén Estany, Montserrat (Universitat de Barcelona)
2014
SORT : statistics and operations research transactions, Vol. 38, Núm. 1 (January-June 2014) , p. 1-1  ;
 Accés restringit a la UAB
2014-05-05
15:29

8 p, 112.1 KB
Analysis of inequality in fertility curves fitted by gamma distributions / Ramos, Héctor M. ; Peinado, Antonio ; Ollero, Jorge ; Ramos, María G. (Universidad de Cádiz. Departamento de Estadística e Investigacíon Operativa)
The aim of this paper is to analyse fertility curves from a novel viewpoint, that of inequality. Through sufficient conditions that can be easily verified, we compare inequality, in the Lorenz and Generalized Lorenz sense, in fertility curves fitted by gamma distributions, thus achieving a useful complementary instrument for demographic analysis. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 2 (July-December 2013) , p. 233-240  ;
 Accés restringit a la UAB
2014-05-05
15:25

20 p, 656.9 KB
Double bounded Kumaraswamy-power series class of distributions / Bidram, Hamid (University of Isfahan (Irán). Department of Statistics) ; Nekoukhou, Vahid (University of Isfahan (Irán). Department of Statistics)
In this paper, we will introduce the new Kumaraswamy-power series class of distributions. This new class is obtained by compounding the Kumaraswamy distribution of Kumaraswamy (1980) and the family of power series distributions. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 2 (July-December 2013) , p. 211-230  ;
 Accés restringit a la UAB
2014-05-05
15:21

22 p, 230.3 KB
An alternative to Kim and Warde’s mixed randomized response model / Singh, Housila P. ; Tarray, Tanveer A. (Vikram University. School of Studies in Statistics)
When open or direct surveys are about sensitive matters (e. g. gambling habits, addiction to drug and others intoxicants, alcoholism, proneness to tax invasion, induced abortions, drunken driving, history of past involvement in crimes, and homosexuality), non-response bias and response bias become serious problems because people oftentimes do not wish to give correct information. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 2 (July-December 2013) , p. 189-210  ;
 Accés restringit a la UAB
2014-05-05
15:17

14 p, 162.2 KB
Quantile estimation of the rejection distribution of food products integrating assessor values and interval-censored consumer data / Langohr, Klaus (Universitat Politècnica de Catalunya. Departament d'Estadística i Investigació Operativa) ; Gómez, Guadalupe (Universitat Politècnica de Catalunya. Departament d'Estadística i Investigació Operativa) ; Hough, Guillermo (Instituto Superior Experimental de Tecnología Alimentaria. Departamento de Evaluación Sensorial de Alimentos)
Fitting parametric survival models with interval-censored data is a common task in survival analysis and implemented in many statistical software packages. Here, we present a novel approach to fit such models if the values on the scale of interest are measured with error. [...]
2013
SORT : statistics and operations research transactions, Vol. 37, Núm. 2 (July-December 2013) , p. 175-188  ;
 Accés restringit a la UAB