Author

Yen-Chi Chen

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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 Aug 2026

On efficiency gains via augmenting a tiny sample with a massive auxiliary sample

In this paper, we study the problem of augmenting a tiny target sample with a massive auxiliary sample. Utilizing Tukey's factorization, there are two popular approaches: the inverse probability weight (IPW) and the full-likelihood (FL) methods. We show that the IPW approach suffers from the limited target sample probl...

Yen-Chi Chen · 0 citations