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A novel characterization of structures in smooth regressi...
[Submitted on 30 Oct 2023 (v1), last revised 12 Jun 2026 (this v · 2026-06-15 · via stat updates on arXiv.org

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Abstract:We characterize structures such as monotonicity, convexity, and modality in smooth regression curves using persistent homology. Persistent homology is a key tool in topological data analysis that detects higher-dimensional topological features such as connected components and holes (cycles or loops) in the data. In other words, persistent homology is a multiscale version of homology that characterizes sets based on the connected components and holes. We use super-level sets of functions to extract geometric features via persistent homology. In particular, we explore structures in regression curves via the persistent homology of super-level sets of a function, where the function of interest is - the first derivative of the regression function.
In the course of this study, we extend an existing procedure of estimating the persistent homology for the first derivative of a regression function and establish its consistency. Moreover, as an application of the proposed methodology, we demonstrate that the persistent homology of the derivative of a function can reveal hidden structures in the function that are not visible from the persistent homology of the function itself. In particular, we characterize structures such as monotonicity, convexity, and modality, and propose a measure of statistical significance to infer these structures in practice. Finally, we conduct an empirical study to implement the proposed methodology on simulated and real data sets and compare the derived results with an existing methodology.

Submission history

From: Satish Kumar [view email]
[v1] Mon, 30 Oct 2023 10:49:09 UTC (99 KB)
[v2] Mon, 15 Jan 2024 07:43:13 UTC (111 KB)
[v3] Mon, 13 Jan 2025 06:06:14 UTC (156 KB)
[v4] Sat, 25 Oct 2025 20:39:14 UTC (556 KB)
[v5] Fri, 12 Jun 2026 10:49:28 UTC (558 KB)