55 citations · 130 across the 15 of their papers we have counts for
15 papers
Möbius transport on spheres
Eduargo García-Portugués, Shogo Kato
The Möbius transformation that generates the spherical Cauchy distribution from the uniform is the tangent-normal lift of a one-dimensional optimal transport: the monotone rearrang…
A bivariate cure copula model with zero-inflated gamma frailty for right-censored data
Masaki Hino, Shogo Kato, Takeshi Emura
In biomedical studies, paired survival data arise naturally when two event times are observed within the same subject. Existing statistical models seldom accommodate both cure frac…
Minimum Copula Divergence for Robust Estimation
Shinto Eguchi, Shogo Kato
This paper introduces a robust estimation framework based solely on the copula function. We begin by introducing a family of divergence measures tailored for copulas, including the…
Directional data analysis using the spherical Cauchy and the Poisson kernel-based distribution
Michail Tsagris, Panagiotis Papastamoulis, Shogo Kato
In 2020, two novel distributions for the analysis of directional data were introduced: the spherical Cauchy distribution and the Poisson kernel-based distribution. This paper provi…
Measuring and testing tail equivalence
Takaaki Koike, Shogo Kato, Toshinao Yoshiba
We call two copulas tail equivalent if their first-order approximations in the tail coincide. As a special case, a copula is called tail symmetric if it is tail equivalent to the a…
Traffic Count Data Analysis Using Mixtures of Kato--Jones Distributions
Kota Nagasaki, Shogo Kato, Wataru Nakanishi +1
We discuss the modelling of traffic count data that show the variation of traffic volume within a day. For the modelling, we apply mixtures of Kato-Jones distributions in which eac…
Measuring non-exchangeable tail dependence using tail copulas
Takaaki Koike, Shogo Kato, Marius Hofert
Quantifying tail dependence is an important issue in insurance and risk management. The prevalent tail dependence coefficient (TDC), however, is known to underestimate the degree o…
Copula-based measures of asymmetry between the lower and upper tail probabilities
Shogo Kato, Toshinao Yoshiba, Shinto Eguchi
We propose a copula-based measure of asymmetry between the lower and upper tail probabilities of bivariate distributions. The proposed measure has a simple form and possesses some…
Flexible random-effects distribution models for meta-analysis
Hisashi Noma, Kengo Nagashima, Shogo Kato +2
In meta-analysis, the random-effects models are standard tools to address between-study heterogeneity in evidence synthesis analyses. For the random-effects distribution models, th…
Möbius transformation and a Cauchy family on the sphere
Shogo Kato, Peter McCullagh
We present some properties of a Cauchy family of distributions on the sphere, which is a spherical extension of the wrapped Cauchy family on the circle. The spherical Cauchy family…
A flexible family of distributions on the cylinder
Shonosuke Sugasawa, Kunio Shimizu, Shogo Kato
We propose a flexible family of distributions, generalized -distributions, on the cylinder which is obtained as a conditional distribution of a trivariate distribution. The…
A characterization of a Cauchy family on the complex space
Shogo Kato, Peter McCullagh
It is shown that a family of distributions on the complex space is characterized as the only family such that the orbit of one distribution under a certain group of transformations…
An extended family of circular distributions related to wrapped Cauchy distributions via Brownian motion
Shogo Kato, M. C. Jones
We introduce a four-parameter extended family of distributions related to the wrapped Cauchy distribution on the circle. The proposed family can be derived by altering the settings…
Robust estimation of location and concentration parameters for the von Mises-Fisher distribution
Shogo Kato, Shinto Eguchi
Robust estimation of location and concentration parameters for the von Mises-Fisher distribution is discussed. A key reparametrisation is achieved by expressing the two parameters…
A distribution for a pair of unit vectors generated by Brownian motion
Shogo Kato
We propose a bivariate model for a pair of dependent unit vectors which is generated by Brownian motion. Both marginals have uniform distributions on the sphere, while the conditio…