Recent advances in directional statistics

A Pewsey, E García-Portugués - Test, 2021 - Springer
Mainstream statistical methodology is generally applicable to data observed in Euclidean
space. There are, however, numerous contexts of considerable scientific interest in which …

Flexible models for complex data with applications

C Ley, S Babić, D Craens - Annual Review of Statistics and Its …, 2021 - annualreviews.org
Probability distributions are the building blocks of statistical modeling and inference. It is
therefore of the utmost importance to know which distribution to use in what circumstances …

Initialization of hidden Markov and semi‐Markov models: A critical evaluation of several strategies

A Maruotti, A Punzo - International Statistical Review, 2021 - Wiley Online Library
The expectation–maximization (EM) algorithm is a familiar tool for computing the maximum
likelihood estimate of the parameters in hidden Markov and semi‐Markov models. This …

A tractable, parsimonious and flexible model for cylindrical data, with applications

T Abe, C Ley - Econometrics and Statistics, 2017 - Elsevier
New cylindrical distributions are proposed by combining the sine-skewed von Mises
distribution (circular part) with the Weibull distribution (linear part). This new model, the …

Segmentation of sea current fields by cylindrical hidden Markov models: a composite likelihood approach

M Ranalli, F Lagona, M Picone… - Journal of the Royal …, 2018 - academic.oup.com
Motivated by segmentation issues in studies of sea current circulation, we describe a hidden
Markov random field for the analysis of spatial cylindrical data, ie bivariate spatial series of …

The trivariate wrapped Cauchy copula--a multi-purpose model for angular data

S Kato, C Ley, S Loizidou - arXiv preprint arXiv:2401.10824, 2024 - arxiv.org
In this paper, we will present a new flexible distribution for three-dimensional angular data,
or data on the three-dimensional torus. Our trivariate wrapped Cauchy copula has the …

Dynamic mixtures of factor analyzers to characterize multivariate air pollutant exposures

A Maruotti, J Bulla, F Lagona, M Picone, F Martella - 2017 - projecteuclid.org
The assessment of pollution exposure is based on the analysis of a multivariate time series
that include the concentrations of several pollutants as well as the measurements of multiple …

Regime switching models for circular and linear time series

A Harvey, D Palumbo - Journal of Time Series Analysis, 2023 - Wiley Online Library
The score‐driven approach to time series modelling is able to handle circular data and
switching regimes with intra‐regime dynamics. Furthermore it enables a dynamic model to …

Model-based segmentation of spatial cylindrical data

F Lagona, M Picone - Journal of Statistical Computation and …, 2016 - Taylor & Francis
ABSTRACT A new hidden Markov random field model is proposed for the analysis of
cylindrical spatial series, ie bivariate spatial series of intensities and angles. It allows us to …

Copula-based segmentation of cylindrical time series

F Lagona - Statistics & Probability Letters, 2019 - Elsevier
A hidden Markov model is proposed for segmenting cylindrical time series according to a
finite number of latent classes, associated with copula-based cylindrical densities. It …