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dc.contributor.authorMinas, Giorgos
dc.contributor.authorAston, John A D
dc.contributor.authorStallard, Nigel
dc.date.accessioned2018-08-03T09:30:10Z
dc.date.available2018-08-03T09:30:10Z
dc.date.issued2014-06
dc.identifier.citationMinas , G , Aston , J A D & Stallard , N 2014 , ' Adaptive multivariate global testing ' , Journal of the American Statistical Association , vol. 109 , no. 506 , pp. 613-623 . https://doi.org/10.1080/01621459.2013.870905en
dc.identifier.issn0162-1459
dc.identifier.otherPURE: 255153824
dc.identifier.otherPURE UUID: fb70375a-37f6-44f9-9771-00f1eba89a78
dc.identifier.otherPubMed: 25125767
dc.identifier.otherPubMedCentral: PMC4114150
dc.identifier.otherScopus: 84987876571
dc.identifier.otherORCID: /0000-0001-7953-706X/work/47136661
dc.identifier.urihttp://hdl.handle.net/10023/15760
dc.description.abstractWe present a methodology for dealing with recent challenges in testing global hypotheses using multivariate observations. The proposed tests target situations, often arising in emerging applications of neuroimaging, where the sample size n is relatively small compared with the observations' dimension K. We employ adaptive designs allowing for sequential modifications of the test statistics adapting to accumulated data. The adaptations are optimal in the sense of maximizing the predictive power of the test at each interim analysis while still controlling the Type I error. Optimality is obtained by a general result applicable to typical adaptive design settings. Further, we prove that the potentially high-dimensional design space of the tests can be reduced to a low-dimensional projection space enabling us to perform simpler power analysis studies, including comparisons to alternative tests. We illustrate the substantial improvement in efficiency that the proposed tests can make over standard tests, especially in the case of n smaller or slightly larger than K. The methods are also studied empirically using both simulated data and data from an EEG study, where the use of prior knowledge substantially increases the power of the test. Supplementary materials for this article are available online.
dc.format.extent11
dc.language.isoeng
dc.relation.ispartofJournal of the American Statistical Associationen
dc.rights© Giorgos Minas, John Aston, Nigel Stallard. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.en
dc.subjectAdaptive designen
dc.subjectMultivariate testen
dc.subjectNeuroimagingen
dc.subjectPower analysisen
dc.subjectQA Mathematicsen
dc.subject.lccQAen
dc.titleAdaptive multivariate global testingen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Statisticsen
dc.identifier.doihttps://doi.org/10.1080/01621459.2013.870905
dc.description.statusPeer revieweden


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