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An iterated $I$-projection procedure for solving the gene...
[Submitted on 2 Sep 2025 (v1), last revised 22 Jul 2026 (this ve · 2025-09-03 · via stat updates on arXiv.org

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Abstract:The minimum information copula principle initially suggested in \cite{MeeBed97} is a maximum entropy-like approach for finding the least informative copula, if it exists, that satisfies a certain number of expectation constraints specified either from domain knowledge or the available data. We first propose a generalization of this principle allowing the inclusion of additional constraints fixing certain higher-order margins of the copula. We next show that the associated optimization problem has a unique solution under a natural condition. As the latter problem is intractable in general we consider its version with all the probability measures involved in its formulation replaced by checkerboard approximations. This amounts to attempting to solve a so-called discrete $I$-projection linear problem. We then exploit the seminal results of \cite{Csi75} to derive an iterated procedure for solving the latter and provide theoretical guarantees for its convergence. The usefulness of the procedure is finally illustrated via numerical experiments in dimensions up to four with substantially finer discretizations than those encountered in the literature.

Submission history

From: Ivan Kojadinovic [view email]
[v1] Tue, 2 Sep 2025 20:51:02 UTC (2,275 KB)
[v2] Fri, 1 May 2026 11:16:29 UTC (2,435 KB)
[v3] Wed, 22 Jul 2026 14:38:17 UTC (2,477 KB)