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dc.contributor.authorGodsill, Simon
dc.contributor.authorKındap, Yaman
dc.date.accessioned2022-01-07T16:49:29Z
dc.date.available2022-01-07T16:49:29Z
dc.date.issued2022-02-15
dc.date.submitted2021-06-20
dc.identifier.issn0960-3174
dc.identifier.others11222-021-10072-0
dc.identifier.other10072
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/332367
dc.description.abstract<jats:title>Abstract</jats:title><jats:p>In this paper novel simulation methods are provided for the generalised inverse Gaussian (GIG) Lévy process. Such processes are intractable for simulation except in certain special edge cases, since the Lévy density associated with the GIG process is expressed as an integral involving certain Bessel functions, known as the Jaeger integral in diffusive transport applications. We here show for the first time how to solve the problem indirectly, using generalised shot-noise methods to simulate the underlying point processes and constructing an auxiliary variables approach that avoids any direct calculation of the integrals involved. The resulting augmented bivariate process is still intractable and so we propose a novel thinning method based on upper bounds on the intractable integrand. Moreover, our approach leads to lower and upper bounds on the Jaeger integral itself, which may be compared with other approximation methods. The shot noise method involves a truncated infinite series of decreasing random variables, and as such is approximate, although the series are found to be rapidly convergent in most cases. We note that the GIG process is the required Brownian motion subordinator for the generalised hyperbolic (GH) Lévy process and so our simulation approach will straightforwardly extend also to the simulation of these intractable processes. Our new methods will find application in forward simulation of processes of GIG and GH type, in financial and engineering data, for example, as well as inference for states and parameters of stochastic processes driven by GIG and GH Lévy processes.</jats:p>
dc.languageen
dc.publisherSpringer Science and Business Media LLC
dc.subjectArticle
dc.subjectLévy process
dc.subjectGeneralised hyperbolic process
dc.subjectDiffusive transport
dc.subjectJaeger integral
dc.subjectSeries representations
dc.subjectMonte Carlo methods
dc.titlePoint process simulation of generalised inverse Gaussian processes and estimation of the Jaeger integral
dc.typeArticle
dc.date.updated2022-01-07T16:49:28Z
prism.issueIdentifier1
prism.publicationNameStatistics and Computing
prism.volume32
dc.identifier.doi10.17863/CAM.79813
dcterms.dateAccepted2021-12-04
rioxxterms.versionofrecord10.1007/s11222-021-10072-0
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidKındap, Yaman [0000-0002-9269-039X]
dc.identifier.eissn1573-1375
cam.issuedOnline2021-12-29


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