Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Unidimensionality"”.
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Refinement of Stout's Procedure for Assessing Latent Trait Unidimensionality
… on which this IRT methodology is based is "unidimensionality". In general this assumption means that the items measure one and only one dimension or ability. In practice, however, this assumption cannot be strictly met because a multitude of factors influence test performance. What is …
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Assessing Unidimensionality of Test Items and Some Asymptotics of Parametric Item Response Theory
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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New nonparametric statistical procedures for analyzing bias/DIF and dimensionality in item response data
Unidimensionality is one of the most important assumptions required by much of the currently used item response theory (IRT) methodologies. In the first part of this thesis, a further and non-trivial practical refinement of DIMTEST(Stout, 1987; Nandakumar & Stout, 1993) is made to assess latent …
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An application of item response theory to language testing: Model-data fit studies
… The tenability of the strong assumption of unidimensionality has not been studied systematically, and little is known concerning the effects of departure from unidimensionality on the estimation of parameters and on model fit. Furthermore, no study has examined the adequacy of the Rasch …
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New techniques for the dimensionality assessment of standardized test data
… this index remarkably quantifies lack of unidimensionality in the test data, and the asymptotic behavior of this index under unidimensionality provides theoretical justification.
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An Investigation of Unidimensional Testing Procedures under Latent Trait Theory using Principal Component Analysis
… several generally accepted rules for detecting unidimensionality, but none are well tested. This simulation study investigated well-known methods, including but not limited to, the Kaiser (k>1) Criterion, Percentage of Measure Validity (greater than 50%, 40%, or 20%), Ratio of Eigenvalues, and …
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Construct Validity Evidence Based on Internal Structure: Exploring and Comparing the Use of Rasch Measurement Modeling and Factor Analysis with a Measure of Student Motivation
… individually, all three methods corroborated unidimensionality; however, when all items were analyzed together, the multi-factor model identified through EFA was not supported by the Rasch or CFA analysis. While EFA provided the best information about individual item functioning, Rasch …
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Assessing The Dimensionality of Polytomous Item Exams
<p> Unidimensionality is a main assumption for Item Response Theory (IRT) models that are applied to statewide standardized tests for purposes such as scoring, equating, scaling, and DIF analyses. Thus, it is important that the unidimensionality evaluation of tests be efficiently and effectively …
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Formulating a Dimtest-Based Effect Size Measure and a New DIMTEST Statistic and Their Applications
… used method for testing the hypothesis of test unidimensionality as represented by local item independence. There are six chapters in this dissertation. Chapter 1 addresses the importance of assessing unidimensionality and provides a review of the literature and methods. Chapter 2 reviews basic …
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An investigation of the relationships between issue-specific channel conflict and cooperation and overall channel conflict and cooperation
… parasimulation, to assess the reliability and unidimensionality of the measurement models, and to test the manipulation of the independent variables. Subsequently, the main experiments were conducted. Both phases employed two research designs. Research design one, a 2x2 factorial, examined the …
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Analysis of the Scale of Parenting and Life Functioning Using the Rasch Measurement Model
… the SPLF showed good overall fit to the model. Unidimensionality of the scale was supported in the analysis, with over 60% of the raw variance explained by the measure. Item fit also provided evidence that the items fit the model. Scale categories displayed clear monotonicity. No differential …
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The Strength of Multidimensional Item Response Theory in Exploring Construct Space that is Multidimensional and Correlated
… reinforcing the requisite assumption of unidimensionality when applying the 1-PL IRT model.
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Work-family conflict and turnover intention amongst blue-collar workers : does resilience play a role?
… Exploratory factor analysis illustrated the unidimensionality of work-family conflict, however there was a strong theoretical argument to treat work-family conflict as separate dimensions for further analysis. Higher levels of strain-based conflict were reported by female blue-collar workers …
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The Implicit Association Test as a Measure of Attitudinal Biases Towards Individuals with Disabilities: Assessing the Convergent Validity with the Interaction with Disabled Persons Scale and Tringo's Disability Social Distance Scale
… were discussed. Drawbacks (e.g., fakeability and unidimensionality) of traditional paper-and-pencil tests were presented. The Implicit Association Test (IAT), Interaction with Disabled Persons Scale (IDP), Tringo's Disability Social Distance Scale (DSDS), and Marlowe-Crowne Social Desirability …
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Adaptación y propiedades psicométricas de la escala Resistance to Change (RTC-11)
… factor analysis which demonstrated the unidimensionality of the RTC-11 scale. In addition, reliability evidence was collected using the omega coefficient, obtaining an accepted value of .82. Finally, scales were prepared using percentiles. In this way, it is considered that the test can …
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The relationship between work-family conflict and burnout amongst call center employees: Optimism and a moderator
… Exploratory factor analysis demonstrated the unidimensionality of work-to-family conflict despite the two-dimensional model that was expected. Bivariate regression analysis showed that work-to-family conflict explained a significant proportion of the variance in both dimensions of burnout – …
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Robustness redressed : an exploratory study on the relationships among overall assumption violation, model-data-fit, and invariance properties for item response theory models
… taken as being equivalent to the assumption of unidimensionality, and Humphreys' pattern index "p" was used to assess the degree of unidimensionality assumption violation. Means and standard deviations of Yen's Q [i subscript] were used to assess the model-data-fit of items at the total test …
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Measuring Change in Jurisdiction Achievement over Time: Equating Issues in Current International Assessment Programs
… the IRT model assumptions, in particular the unidimensionality assumption. In addition, the estimation of jurisdiction results based on a common international scale may potentially distort the results of those jurisdictions that have levels of student achievement that are much lower or higher …
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Creating and Validating a Measure of Customer Equity in Hospitality Businesses: Linking Shareholder Value With Return on Marketing
… validity, and internal consistency, indicating unidimensionality of the constructs. To further validate the newly developed scale, criterion validity was checked in correlation with six criterion measures using data collected from 590 hospitality industry consumers. The results demonstrate that …
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Assessment of Hopelessness in Older Adults: The Development and Initial Validation of the Hopelessness Inventory for Later Life (HILL)
… components analysis was then used to examine unidimensionality and to identify additional items for deletion. Based on these analyses, two viable versions of the scale, the HILL and the HILL-Shortened (HILL-S) were proposed. Both exhibited strong item-response characteristics, as well as …
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