Bayesian Estimation of the Degrees of Freedom Parameter of the Student-t Distribution—A Beneficial Re-parameterization

Darjus Hosszejni*

*Korrespondierende*r Autor*in für diese Arbeit

Publikation: Working/Discussion PaperWorking Paper/Preprint


In this paper, conditional data augmentation (DA) is investigated for the degrees of freedom parameter ν of a Student-t distribution. Based on a restricted version of the expected augmented Fisher information, it is conjectured that the ancillarity DA is progressively more efficient for MCMC estimation than the sufficiency DA as ν increases; with the break even point lying at as low as ν≈4. The claim is examined further and generalized through a large simulation study and a application to U.S. macroeconomic time series. Finally, the ancillarity-sufficiency interweaving strategy is empirically shown to combine the benefits of both DAs. The proposed algorithm may set a new standard for estimating ν as part of any model.
PublikationsstatusVeröffentlicht - 2021

Österreichische Systematik der Wissenschaftszweige (ÖFOS)

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