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Likelihood-based Spacings Goodness-of-Fit Statistics for Univariate Shape-constrained Densities
[Submitted on 23 Nov 2022 (v1), last revised 3 Jul 2026 (this ve · 2022-11-24 · via stat updates on arXiv.org

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Abstract:A variety of statistics based on sample spacings have been studied for testing goodness-of-fit to parametric distributions. To test the goodness-of-fit to a nonparametric class of univariate shape-constrained densities, including widely studied classes such as k-monotone and log-concave densities, a likelihood ratio test with a working alternative density estimate based on the spacings of the observations is considered, and is shown to be asymptotically normal and distribution-free under the null, consistent under fixed and certain local alternatives, and admits bootstrap calibration. The distribution-freeness under the null comes from the fact that the asymptotic dominant term depends only on a function of the spacings of transformed outcomes that are uniformly distributed. Applications and extensions of theoretical results in the literature of shape-constrained estimation are required to show that the average log-density ratio converges to zero at a faster rate than the sample spacing term under the null, and diverges under the alternatives. Numerical studies are conducted to demonstrate that the test is applicable to various classes of shape-constrained densities and has a good balance between type-I error control under the null and power under alternative distributions.

Submission history

From: Hok Kan Ling [view email]
[v1] Wed, 23 Nov 2022 19:38:20 UTC (723 KB)
[v2] Fri, 25 Oct 2024 13:20:44 UTC (534 KB)
[v3] Fri, 3 Jul 2026 16:35:54 UTC (193 KB)