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dc.contributor.authorStokell, BG
dc.contributor.authorShah, RD
dc.date.accessioned2022-06-29T19:46:34Z
dc.date.available2022-06-29T19:46:34Z
dc.date.issued2022
dc.date.submitted2021-10-03
dc.identifier.issn0960-3174
dc.identifier.others11222-022-10110-5
dc.identifier.other10110
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/338521
dc.description.abstractThere are a variety of settings where vague prior information may be available on the importance of predictors in high-dimensional regression settings. Examples include ordering on the variables offered by their empirical variances (which is typically discarded through standardisation), the lag of predictors when fitting autoregressive models in time series settings, or the level of missingness of the variables. Whilst such orderings may not match the true importance of variables, we argue that there is little to be lost, and potentially much to be gained, by using them. We propose a simple scheme involving fitting a sequence of models indicated by the ordering. We show that the computational cost for fitting all models when ridge regression is used is no more than for a single fit of ridge regression, and describe a strategy for Lasso regression that makes use of previous fits to greatly speed up fitting the entire sequence of models. We propose to select a final estimator by cross-validation and provide a general result on the quality of the best performing estimator on a test set selected from among a number $M$ of competing estimators in a high-dimensional linear regression setting. Our result requires no sparsity assumptions and shows that only a $\log M$ price is incurred compared to the unknown best estimator. We demonstrate the effectiveness of our approach when applied to missing or corrupted data, and time series settings. An R package is available on github.
dc.languageen
dc.publisherSpringer Science and Business Media LLC
dc.subjectArticle
dc.subjectHigh-dimensional data
dc.subjectLow variance filter
dc.subjectLasso
dc.subjectRidge regression
dc.subjectMissing data
dc.subjectCorrupted data
dc.titleHigh-dimensional regression with potential prior information on variable importance
dc.typeArticle
dc.date.updated2022-06-29T19:46:34Z
prism.issueIdentifier3
prism.publicationNameStatistics and Computing
prism.volume32
dc.identifier.doi10.17863/CAM.85934
dcterms.dateAccepted2022-05-16
rioxxterms.versionofrecord10.1007/s11222-022-10110-5
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidShah, RD [0000-0001-9073-3782]
dc.identifier.eissn1573-1375
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/N031938/1)
cam.issuedOnline2022-06-14


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