Local Fr\'echet Regression with Riemannian Predictors

Fréchet regression is well developed for Euclidean predictors, but local linear methods remain limited for general manifold-valued predictors.

We propose local constant and local linear estimators for predictors lying on a general Riemannian manifold and responses taking values in a general metric space.

The proposed local linear estimator is the first local linear Fréchet regression method in this setting.

Our construction uses geodesic neighborhoods, logarithmic-map coordinates, volume-density correction, and frame-invariant scalar equivalent weights.

For both estimators, we establish not only pointwise consistency and convergence rates but also uniform consistency and convergence rates.

Simulations and real data applications demonstrate the finite-sample performance and practical applicability of the proposed methods across diverse predictor and response geometries.