Marginal reversible jump Markov chain Monte Carlo with application to motor unit number estimation
Drovandi, Christopher C., Pettitt, Anthony N., Henderson, Robert, & McCombe, Pamela A. (2012) Marginal reversible jump Markov chain Monte Carlo with application to motor unit number estimation. (Submitted (not yet accepted for publication))
Motor unit number estimation (MUNE) is a method which aims to provide a quantitative indicator of progression of diseases that lead to loss of motor units, such as motor neurone disease. However the development of a reliable, repeatable and fast real-time MUNE method has proved elusive hitherto. Ridall et al. (2007) implement a reversible jump Markov chain Monte Carlo (RJMCMC) algorithm to produce a posterior distribution for the number of motor units using a Bayesian hierarchical model that takes into account biological information about motor unit activation. However we find that the approach can be unreliable for some datasets since it can suffer from poor cross-dimensional mixing. Here we focus on improved inference by marginalising over latent variables to create the likelihood. In particular we explore how this can improve the RJMCMC mixing and investigate alternative approaches that utilise the likelihood (e.g. DIC (Spiegelhalter et al., 2002)). For this model the marginalisation is over latent variables which, for a larger number of motor units, is an intractable summation over all combinations of a set of latent binary variables whose joint sample space increases exponentially with the number of motor units. We provide a tractable and accurate approximation for this quantity and also investigate simulation approaches incorporated into RJMCMC using results of Andrieu and Roberts (2009).
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|Additional Information:||Publication details pending|
|Keywords:||Amyotrophic lateral sclerosis, Marginalisation, Markov chain Monte Carlo, Model choice, Motor Neurone disease, Motor unit number estimation, Neurophysiology, Reversible jump|
|Subjects:||Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > STATISTICS (010400)|
|Divisions:||Current > Schools > School of Mathematical Sciences|
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2012 Please consult the authors|
|Deposited On:||19 Nov 2012 14:14|
|Last Modified:||11 Apr 2013 00:03|
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