SORT (Statistics and Operations Research Transactions): Enviaments recents

Ara es mostren els items 13-24 de 258

    • Unusual-event processes for count data 

      Skulpakdee, Wanrudee; Hunkrajok, Mongkol (Institut d'Estadística de Catalunya, 2022-06-02)
      Article
      Accés obert
      At least one unusual event appears in some count datasets. It will lead to a more concentrated (or dispersed) distribution than the Poisson, gamma, Weibull, Conway-Maxwell-Poisson (CMP), and Faddy (1997) models can ...

    • Fifty years later: new directions in Hawkes processes 

      Worrall, John; Browning, Raiha; Wu, Paul; Mengersen, Kerrie (Institut d'Estadística de Catalunya, 2022-06-02)
      Article
      Accés obert
      The Hawkes process is a self-exciting Poisson point process, characterised by a conditional intensity function. Since its introduction fifty years ago, it has been the subject of numerous research directions and continues ...

    • Exponentiated power Maxwell distribution with quantile regression and applications 

      Gallardo, Diego I.; Gómez, Yolanda M.; Segovia, Francisco A. (Institut d'Estadística de Catalunya, 2021-12-13)
      Article
      Accés obert
      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 ...

    • Median bilinear models in presence of extreme values 

      Santolino, Miguel (Institut d'Estadística de Catalunya, 2021-12-02)
      Article
      Accés obert
      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 ...

    • Bayesian hierarchical nonlinear modelling of intra-abdominal volume during pneumoperitoneum for laparoscopic surgery 

      Calvo, Gabriel; Armero, Carmen; Gómez-Rubio, Virgilio; Mazzinari, Guido (Institut d'Estadística de Catalunya, 2021-11-30)
      Article
      Accés obert
      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 ...

    • Modified almost unbiased two-parameter estimator for the Poisson regression model with an application to accident data 

      Alheety, Mustafa I.; Qasim, Muhammad; Månsson, Kristofer; Kibria, B. M. Golam (Institut d'Estadística de Catalunya, 2021-11-30)
      Article
      Accés obert
      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 ...

    • Nonparametric estimation of the probability of default with double smoothing 

      Peláez, Rebeca; Cao, Ricardo; Vilar, Juan M. (Institut d'Estadística de Catalunya, 2021-11-30)
      Article
      Accés obert
      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, ...

    • The unilateral spatial autogressive process for the regular lattice two-dimensional spatial discrete data 

      Chutoo, Azmi; Karlis, Dimitris; Khan, Naushad Mamode; Jowaheer, Vandna (Institut d'Estadística de Catalunya, 2021-06-15)
      Article
      Accés obert
      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 ...

    • Joint outlier detection and variable selection using discrete optimization 

      Jammal, Mahdi; Canu, Stephane; Abdallah, Maher (Institut d'Estadística de Catalunya, 2021-06-15)
      Article
      Accés obert
      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 ...

    • Bayesian classification for dating archaeological sites via projectile points 

      Armero, Carmen; García-Donato, Gonzalo; Jimenez-Puerto, Joaquín; Pardo-Gordó, Salvador; Bernabeu, Joan (Institut d'Estadística de Catalunya, 2021-06-15)
      Article
      Accés obert
      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. ...

    • Verifying compliance with ballast water standards: a decision-theoretic approach 

      Costa, Eliardo G.; Paulino, Carlos Daniel; Singer, Julio M (Institut d'Estadística de Catalunya, 2021-06-15)
      Article
      Accés obert
      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 ...

    • The radiant diagrams of Florence Nightingale 

      Friendly, Michael; Andrews, Raymond (Institut d'Estadística de Catalunya, 2021-06-15)
      Article
      Accés obert
      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, ...