Ishrak Alhajj Hassan

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math.ST2026

Local quadratic convergence of iterated correlation matrices: bounds and counterexamples

Ishrak Alhajj Hassan

Kruskal's unpublished manuscript on CONCOR gives a local argument for convergence of successive correlations to a prescribed two-class sign pattern. We identify a failure in its st…

math.ST2026

Finite-Step Bounds for Iterated Correlation Matrices

Ishrak AlhajjHassan

We establish finite-step probabilistic upper bounds on the contraction ratios $ρ_{k} = Δ_{k + 1} / Δ_{k}$ for iterated Pearson correlation dynamics. Let $(P_{k})_{k \geq 0}$ be the sequence ge…