Author

Yikun Zhang

Department of Statistics, University of Washington

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Preprint Oct 2026

Gradient-Guided Density Peak Clustering

Density peak clustering (DPC) connects each observation to its nearest neighbor of higher density and identifies cluster centers as high-density observations with unusually large nearest neighbor uphill shifts. The resulting uphill paths from observations to cluster centers, however, can be irregular and unstable in lo...

Yikun Zhang, Yen-Chi Chen · 0 citations

Preprint Jul 2026

Emputation: Identification-Guided Neural Imputation Framework

It is shown that the population minimizer of the emputation risk recovers the target extrapolation distribution under a broad class of identification assumptions, including several missing-not-at-random assumptions.

Yanjiao Yang, Yikun Zhang, Xinwei Shen et al. · 0 citations