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Fast and accuratemodelling oflongitudinal andrepeated measuresneuroimaging data Bryan GuillaumeXue HuaPaul M. Thompson2014 год

Fast and accurate modelling of longitudinal and repeated measures neuroimaging data
статья из журнала

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Аннотация: Despite the growing importance of longitudinal data in neuroimaging, the standard analysis methods make restrictive or unrealistic assumptions (e.g., assumption of Compound Symmetry--the state of all equal variances and equal correlations--or spatially homogeneous longitudinal correlations). While some new methods have been proposed to more accurately account for such data, these methods are based on iterative algorithms that are slow and failure-prone. In this article, we propose the use of the Sandwich Estimator method which first estimates the parameters of interest with a simple Ordinary Least Square model and second estimates variances/covariances with the "so-called" Sandwich Estimator (SwE) which accounts for the within-subject correlation existing in longitudinal data. Here, we introduce the SwE method in its classic form, and we review and propose several adjustments to improve its behaviour, specifically in small samples. We use intensive Monte Carlo simulations to compare all considered adjustments and isolate the best combination for neuroimaging data. We also compare the SwE method to other popular methods and demonstrate its strengths and weaknesses. Finally, we analyse a highly unbalanced longitudinal dataset from the Alzheimer's Disease Neuroimaging Initiative and demonstrate the flexibility of the SwE method to fit within- and between-subject effects in a single model. Software implementing this SwE method has been made freely available at http://warwick.ac.uk/tenichols/SwE.
Год издания: 2014
Авторы: Bryan Guillaume, Xue Hua, Paul M. Thompson, Lourens Waldorp, Thomas E. Nichols
Издательство: Elsevier BV
Источник: NeuroImage
Ключевые слова: Advanced Neuroimaging Techniques and Applications, Meta-analysis and systematic reviews, Functional Brain Connectivity Studies
Другие ссылки: NeuroImage (HTML)
Europe PMC (PubMed Central) (PDF)
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Open Repository and Bibliography (University of Liège) (PDF)
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Data Archiving and Networked Services (DANS) (PDF)
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PubMed Central (HTML)
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