55 citations · 130 across the 15 of their papers we have counts for
7 papers · 1 filter
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…
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…
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…
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…