Mahalanobis distance with an adapted within-author covariance matrix: An authorship verification experiment.
The rotated delta, which is argued to be a theoretically better-grounded distance measure, has failed to receive any empirical support for its superiority. This study revisits the rotated delta—which is more commonly known as the Mahalanobis distance in other areas—with two different covariance matr...
| Publicado en: | Digital Scholarship in the Humanities Vol. 37; no. 4; pp. 1051 - 1073 |
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| Formato: | Artículo |
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Oxford University Press / USA
Dec2022
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=159850244&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 159850244 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 2055768X JEO9 jtl: Digital Scholarship in the Humanities issn: 2055768X maglogo: N pubinfo: dt: Dec2022 vid: 37 iid: 4 pid: 622 pub: Oxford University Press / USA artinfo: ui: 159850244 10.1093/llc/fqac008 ppf: 1051 ppct: 22 formats: fmt: – @attributes: type: T – @attributes: type: P size: 870KB tig: atl: Mahalanobis distance with an adapted within-author covariance matrix: An authorship verification experiment. aug: au: Ishihara, Shunichi affil: Australian National University, Speech and Language Laboratory, Canberra, Australia and Linguistics Program, School of Culture, History and Language, College of Asia and the Pacific , Canberra, ACT, 2600, Australia su: Covariance matrices Authorship Railroad trains Training needs Text messages sug: subj: Covariance matrices Authorship Railroad trains Training needs Text messages ab: The rotated delta, which is argued to be a theoretically better-grounded distance measure, has failed to receive any empirical support for its superiority. This study revisits the rotated delta—which is more commonly known as the Mahalanobis distance in other areas—with two different covariance matrices that are estimated from training data. The first covariance matrix represents the between-author variability, and the second the within-author variability. A series of likelihood ratio-based authorship verification experiments was carried out with some different distance measures. The experiments made use of the documents arranged from a large database of text messages that allowed for a total of 2,160 same-author and 4,663,440 different-author comparisons. The Mahalanobis distance with the between-author covariance matrix performed far worse compared to the other distance measures, whereas the Mahalanobis distance with the within-author covariance matrix performed better than the other measures. However, superior performance relative to the cosine distance is subject to word lengths and/or the order of the feature vector. The result of follow-up experiments further illustrated that the covariance matrix representing the within-author variability needs to be trained using a good amount of data to perform better than the cosine distance: the higher the order of the vector, the more data are required for training. The quantitative results also infer that the two sources of variabilities—notably within- and between-author variabilities—are independent of each other to the extent that the latter cannot accurately approximate the former. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y custom: © 2019 EADH: The European Association for Digital Humanities. item: Digital Scholarship in the Humanities holder: Oxford University Press / USA dt: @attributes: year: 2022 holdings: @attributes: islocal: N |
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