Eltzner's Type I finite sample smeariness conjecture on spheres

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Let XX be a random variable supported on a set ASmA\subset \mathbb{S}^m whose convex closure has nonzero volume and which has a unique Fréchet mean μ\mu. A point μ\mu is Type I finite sample smeary when the empirical Fréchet mean has a nonstandard finite-sample fluctuation rate at μ\mu of Type I. Eltzner's conjecture. If AA has nonzero-volume convex closure and μ\mu is the unique Fréchet mean of XX, then μ\mu is Type I finite sample smeary. This conjecture predicts finite-sample smeariness under a broad geometric support condition on spheres; the supplied text identifies it as a special case of a conjecture stated in earlier work, but gives no resolution.

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Primary source

Susovan Pal, “Finite Sample Smeariness on Spheres and Modulation-aware Tests”, arXiv:2603.20974 (2026).

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