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Neural Networks for Parameter Estimation of the Discretely Observed Hawkes Process
[Submitted on 2 Jun 2025 (v1), last revised 19 Jun 2026 (this ve · 2026-06-23 · via stat updates on arXiv.org

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Abstract:When the sample path of a Hawkes process is observed discretely, such that only the total event counts in disjoint time intervals are known, the likelihood function becomes intractable. To overcome the challenge of likelihood-based inference in this setting, we propose to use a likelihood-free approach that uses simulated data to train a fully connected neural network (NN) to estimate the parameters of the Hawkes process from a summary statistic of the count data. A naive imputation estimate of the parameters forms the basis for our summary statistic, which is fast to generate and requires minimal expert knowledge to design. The resulting NN estimator is comparable to the best extant approximate likelihood estimators in terms of mean-squared error but requires significantly less computational time. We implement NN quantile estimation for fast uncertainty quantification. The proposed estimation procedure is applied to weekly count data for two infectious diseases, with a time-varying background rate used to capture seasonal fluctuations in infection risk.

Submission history

From: Jason Lambe [view email]
[v1] Mon, 2 Jun 2025 02:17:11 UTC (4,232 KB)
[v2] Sat, 21 Jun 2025 04:13:27 UTC (4,207 KB)
[v3] Fri, 19 Jun 2026 00:00:31 UTC (9,603 KB)