Search Results for author: Ioannis Papageorgiou

Found 4 papers, 1 papers with code

The Bayesian Context Trees State Space Model for time series modelling and forecasting

no code implementations2 Aug 2023 Ioannis Papageorgiou, Ioannis Kontoyiannis

The utility of the general framework is illustrated in two particular instances: When autoregressive (AR) models are used as base models, resulting in a nonlinear AR mixture model, and when conditional heteroscedastic (ARCH) models are used, resulting in a mixture model that offers a powerful and systematic way of modelling the well-known volatility asymmetries in financial data.

Bayesian Inference Time Series +1

Change-point Detection and Segmentation of Discrete Data using Bayesian Context Trees

no code implementations8 Mar 2022 Valentinian Lungu, Ioannis Papageorgiou, Ioannis Kontoyiannis

A new Bayesian modelling framework is introduced for piece-wise homogeneous variable-memory Markov chains, along with a collection of effective algorithmic tools for change-point detection and segmentation of discrete time series.

Change Point Detection Time Series +1

Context-tree weighting for real-valued time series: Bayesian inference with hierarchical mixture models

no code implementations6 Jun 2021 Ioannis Papageorgiou, Ioannis Kontoyiannis

At the bottom level, a different real-valued time series model is associated with each context-state, i. e., with each leaf of the tree.

Bayesian Inference Model Selection +2

Bayesian Context Trees: Modelling and exact inference for discrete time series

2 code implementations29 Jul 2020 Ioannis Kontoyiannis, Lambros Mertzanis, Athina Panotopoulou, Ioannis Papageorgiou, Maria Skoularidou

We develop a new Bayesian modelling framework for the class of higher-order, variable-memory Markov chains, and introduce an associated collection of methodological tools for exact inference with discrete time series.

Methodology Information Theory Information Theory Applications Computation

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