On spheres of dimension at least two, Fréchet means can converge at rate n^{-1/6} even when data avoid the antipodal point, a 'geometrical smeariness' that is absent on the circle.
Stability of the Cut Locus and a Central Limit Theorem for Fr\'echet Means of Riemannian Manifolds
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abstract
We obtain a Central Limit Theorem for closed Riemannian manifolds, clarifying along the way the geometric meaning of some of the hypotheses in Bhattacharya and Lin's Omnibus Central Limit Theorem for Fr\'echet means. We obtain our CLT assuming certain stability hypothesis for the cut locus, which always holds when the manifold is compact but may not be satisfied in the non-compact case.
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Geometrical Smeariness -- A new Phenomenon of Fr\'echet Means
On spheres of dimension at least two, Fréchet means can converge at rate n^{-1/6} even when data avoid the antipodal point, a 'geometrical smeariness' that is absent on the circle.