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dc.contributorDepartment of Rehabilitation Sciencesen_US
dc.creatorKhan, Aen_US
dc.creatorChien, CWen_US
dc.creatorBagraith, KSen_US
dc.date.accessioned2015-10-13T08:27:46Z-
dc.date.available2015-10-13T08:27:46Z-
dc.identifier.issn1650-1977en_US
dc.identifier.urihttp://hdl.handle.net/10397/9551-
dc.language.isoenen_US
dc.publisherFoundation for Rehabilitation Informationen_US
dc.rights© 2015 The Authors. Journal Compilation © 2015 Foundation of Rehabilitation Informationen_US
dc.rightsThe following publication Khan A, Chien CW, Bagraith KS. Parametric analyses of summative scores may lead to conflicting inferences when comparing groups: A simulation study. Journal of Rehabilitation Medicine 2015, 47(4): 300-304 is available at https://doi.org/10.2340/16501977-1941. Published in Journal of Rehabilitation Medicine for the Foundation of Rehabilitation Information.en_US
dc.rightsThis article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/).en_US
dc.subjectParametric statisticsen_US
dc.subjectRasch analysisen_US
dc.subjectRasch-based measuresen_US
dc.subjectRating scalesen_US
dc.subjectSimulationen_US
dc.subjectSummative scoresen_US
dc.titleParametric analyses of summative scores may lead to conflicting inferences when comparing groups: A simulation studyen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage300en_US
dc.identifier.epage304en_US
dc.identifier.volume47en_US
dc.identifier.issue4en_US
dc.identifier.doi10.2340/16501977-1941en_US
dcterms.abstractObjective: To investigate whether using a parametric statistic in comparing groups leads to different conclusions when using summative scores from rating scales compared with using their corresponding Rasch-based measures. Methods: A Monte Carlo simulation study was designed to examine between-group differences in the change scores derived from summative scores from rating scales, and those derived from their corresponding Rasch-based measures, using 1-way analysis of variance. The degree of inconsistency between the 2 scoring approaches (i.e. summative and Rasch-based) was examined, using varying sample sizes, scale difficulties and person ability conditions. Results: This simulation study revealed scaling artefacts that could arise from using summative scores rather than Rasch-based measures for determining the changes between groups. The group differences in the change scores were statistically significant for summative scores under all test conditions and sample size scenarios. However, none of the group differences in the change scores were significant when using the corresponding Rasch-based measures. Conclusion: This study raises questions about the validity of the inference on group differences of summative score changes in parametric analyses. Moreover, it provides a rationale for the use of Rasch-based measures, which can allow valid parametric analyses of rating scale data.en_US
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of rehabilitation medicine, Apr. 2015, v. 47, no. 4, p. 300-304en_US
dcterms.isPartOfJournal of rehabilitation medicineen_US
dcterms.issued2015-04-
dc.identifier.scopus2-s2.0-84935507748-
dc.identifier.eissn1651-2081en_US
dc.identifier.rosgroupid2014001001-
dc.description.ros2014-2015 > Academic research: refereed > Publication in refereed journalen_US
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumbera0654-n12-
dc.identifier.SubFormID748-
dc.description.fundingSourceOthersen_US
dc.description.fundingTextThe University of Queenslanden_US
dc.description.pubStatusPublisheden_US
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