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On two overlooked stick-breaking constructions of the normalized inverse Gaussian process
[Submitted on 17 Jun 2026] · 2026-06-18 · via math.ST updates on arXiv.org

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Abstract:We shed light on two alternative stick-breaking constructions of the normalized inverse Gaussian (NIG) random discrete distribution which appear to have been overlooked so far in the Bayesian nonparametric setting. The first is derived from a result in Aldous and Pitman (1998) for the conditional Brownian excursion partition, mixing over the local time at zero up to time one. The second arises as a particular case of a result in James (2013) for priors obtained by a random spatial and temporal change of the normalized generalized Gamma subordinator. Both constructions are in terms of straightforward transformations of standard random variables and can be easily generalized to provide the stick-breaking construction of any element, respectively, in a) the family of mixed Poisson-Kingman models driven by the $1/2$ stable Lévy measure and b) the family of Poisson-Gamma processes driven by the Inverse Gaussian subordinator.

Submission history

From: Annalisa Cerquetti [view email]
[v1] Wed, 17 Jun 2026 17:29:18 UTC (11 KB)

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