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European Journal of Statistics
Article . 2024 . Peer-reviewed
License: CC BY NC
Data sources: Crossref
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Proposal of a Modified Clayton Copula: Theory, Properties and Examples

Authors: Christophe Chesneau;

Proposal of a Modified Clayton Copula: Theory, Properties and Examples

Abstract

The Clayton copula is a mathematical tool used in copula theory to model dependence between random variables. It is a notable member of the Archimedean copula family and is best known for its ability to capture tail dependence. In this article, we present a new modified variant of the Clayton copula that aims to improve its flexibility. The proposed modification scheme perturbs its Archimedean nature by integrating a bivariate product of logarithmic functions and an additional tuning parameter. The elaborated copula benefits from a more nuanced representation of the copula density, and negative dependence can be obtained in a regular manner. We study its properties, including limit results showing some connection with the Gumbel-Barnett copula, important related functions, modifications and extensions, simulation of random couples of values, various lower and upper bounds, various tail dependences, and the correlation properties through the medial correlation and the Kendall tau. As an example of probability application, a new modified bivariate Gaussian distribution is presented via equations and graphics. Finally, two special cases of copula are discussed, including a simple single-parameter copula, which is intended to be a practical alternative to the Clayton copula. A brief analysis on simulated data shows that it may be preferable to the Clayton copula according to the Akaike information criterion. The overall result contributes to the advancement of the theoretical foundations of copula-based modeling techniques.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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