Search Results for author: Gareth W. Peters

Found 10 papers, 0 papers with code

Signature Isolation Forest

no code implementations7 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.

Anomaly Detection

Cyber Loss Model Risk Translates to Premium Mispricing and Risk Sensitivity

no code implementations22 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.

The Nature of Losses from Cyber-Related Events: Risk Categories and Business Sectors

no code implementations21 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.

Stochastic measure distortions induced by quantile processes for risk quantification and valuation

no code implementations10 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.

Cyber Risk Frequency, Severity and Insurance Viability

no code implementations5 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.

Additive models regression

Parsimonious Feature Extraction Methods: Extending Robust Probabilistic Projections with Generalized Skew-t

no code implementations24 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.

Cost-aware Feature Selection for IoT Device Classification

no code implementations2 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.

BIG-bench Machine Learning Classification +4

Bayesian Spatial Field Reconstruction with Unknown Distortions in Sensor Networks

no code implementations16 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.

Computational Efficiency

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