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dc.contributor.advisorBlozis, Shelley Anneen
dc.creatorStacy, Catherine Annen
dc.date.accessioned2011-04-06T21:22:53Zen
dc.date.available2011-04-06T21:22:53Zen
dc.date.issued2001-08en
dc.identifier.urihttp://hdl.handle.net/2152/10837en
dc.descriptiontexten
dc.description.abstractThis dissertation introduces a novel application of mixed-effects receiver operating characteristic (ROC) curve analysis in the study of individual differences. By applying a mixed-effects ordinal regression model to the rating outcomes of a spelling discrimination study, the underlying sensitivities of good and poor undergraduate spellers to a set of correctly spelled and misspelled words were estimated to test two competing hypotheses about individual differences in spelling. Variation in random slopes was modeled as a function of person-level covariates to identify possible predictors of spelling ability. Results provide strong support for the role of strategy-use in spelling discrimination. After partialling for strategy-use, between-group differences for good and poor spellers were greatest on irregular words, lending support to the hypotheses that good spellers have more well-defined mental lexicons than poor spellers. A significant proportion of unexplained variation in the random slopes remained after modeling the ratings assigned to irregular words, suggesting that spelling discrimination may involve additional strategies not identified in this study. This study showed that discrimination accuracy tasks can be sensitive, valid and reliable measures of underlying ability, attesting to their use in the study of individual differences.
dc.format.mediumelectronicen
dc.language.isoengen
dc.rightsCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en
dc.subjectEnglish language--Orthography and spellingen
dc.subjectSpelling abilityen
dc.subjectPsycholinguisticsen
dc.titleApplying mixed-effects receiver operating characteristic (ROC) curve analysis to diagnostic evaluations of human learningen
dc.description.departmentEducational Psychologyen
thesis.degree.departmentEducational Psychologyen
thesis.degree.disciplineEducational Psychologyen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen
dc.rights.restrictionRestricteden


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