no code implementations • 7 Mar 2024 • Guillaume Staerman, Marta Campi, Gareth W. Peters
Functional Isolation Forest (FIF) is a recent state-of-the-art Anomaly Detection (AD) algorithm designed for functional data.
no code implementations • 22 Feb 2022 • Gareth W. Peters, Matteo Malavasi, Georgy Sofronov, Pavel V. Shevchenko, Stefan Trück, Jiwook Jang
We argue that the choice of such methods is akin to a form of model risk and we study the risk sensitivity that arise from choices relating to the class of robust estimation adopted and the impact of the settings associated with such methods on key actuarial tasks such as premium calculation in cyber insurance.
no code implementations • 21 Feb 2022 • Pavel V. Shevchenko, Jiwook Jang, Matteo Malavasi, Gareth W. Peters, Georgy Sofronov, Stefan Trück
In this study we examine the nature of losses from cyber related events across different risk categories and business sectors.
no code implementations • 10 Dec 2021 • Holly Brannelly, Andrea Macrina, Gareth W. Peters
This requires the introduction of a copula function in the composite map for the construction of quantile processes, which presents another new element in the risk quantification and modelling framework based on probability measure distortions induced by quantile processes.
no code implementations • 5 Nov 2021 • Matteo Malavasi, Gareth W. Peters, Pavel V. Shevchenko, Stefan Trück, Jiwook Jang, Georgy Sofronov
We address these questions through a combination of regression models based on the class of Generalised Additive Models for Location Shape and Scale (GAMLSS) and a class of ordinal regressions.
no code implementations • 24 Sep 2020 • Dorota Toczydlowska, Gareth W. Peters, Pavel V. Shevchenko
We propose a novel generalisation to the Student-t Probabilistic Principal Component methodology which: (1) accounts for an asymmetric distribution of the observation data; (2) is a framework for grouped and generalised multiple-degree-of-freedom structures, which provides a more flexible approach to modelling groups of marginal tail dependence in the observation data; and (3) separates the tail effect of the error terms and factors.
no code implementations • 2 Sep 2020 • Biswadeep Chakraborty, Dinil Mon Divakaran, Ido Nevat, Gareth W. Peters, Mohan Gurusamy
In this work, we take a more realistic approach, and argue that feature extraction has a cost, and the costs are different for different features.
no code implementations • 16 Aug 2019 • Qikun Xiang, Ido Nevat, Gareth W. Peters
Spatial regression of random fields based on potentially biased sensing information is proposed in this paper.
no code implementations • 22 Nov 2017 • Wolfgang Fruehwirt, Matthias Gerstgrasser, Pengfei Zhang, Leonard Weydemann, Markus Waser, Reinhold Schmidt, Thomas Benke, Peter Dal-Bianco, Gerhard Ransmayr, Dieter Grossegger, Heinrich Garn, Gareth W. Peters, Stephen Roberts, Georg Dorffner
The diagnosis of Alzheimer's disease (AD) in routine clinical practice is most commonly based on subjective clinical interpretations.
no code implementations • 12 Nov 2017 • Pengfei Zhang, Ido Nevat, Gareth W. Peters, Wolfgang Fruehwirt, Yongchao Huang, Ivonne Anders, Michael Osborne
Next, building on the S-BLUE, we address the second problem, and develop an efficient algorithm for query based sensor set selection with performance guarantee.