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 133 for “"DIF"”.
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Evaluating the robustness of FlexMIRT on DIF analysis
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Investigating the instructional sensitivity of distractors in items exhibiting DIF
… subgroups have comparable ability but different probabilities of correctly responding to an item, the item is said to exhibit differential item functioning (DIF). If the amount of DIF is practically significant, and attributable to features that are irrelevant to the test construct, the …
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Effects of Plain Language Revision on Item Difficulty, Discrimination and DIF
… revision was evaluated for its effects on item difficulty, item discrimination, DIF and DOK.</p> <p>DOK ratings from 2005 and 2007 were compared using Chi-sqaure. One sample t-tests were used to examine the differences in DIF and item difficulty (p-value), as well as item discrimination for ELLs …
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Empirical Evaluation for Gender-Based DIF in an International Assessment: The Case of PIRLS
This study investigated gender differential item functioning (DIF) in the Progress in International Reading Literacy Study (PIRLS) in the 2016 cycle. This is because there is no empirical review of gender DIF in this test. The DIF analyses were conducted within and across three countries which …
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New nonparametric statistical procedures for analyzing bias/DIF and dimensionality in item response data
… mixed dichotomous and polytomous items. The modification is referred to Poly-DIMTEST. The new test statistic for polytomous item scoring was carefully developed and defended with an appropriate asymptotic theory. A simulation study then was carried out to investigate the performance of …
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Using Differential Item Functioning (Dif) Procedures for Investigating the Cross -Cultural Equivalence of Personality Tests
… the same items on each factor. According to the DIF results, the choice of matching variables based on a combination of internal and external measures appeared to have little effect and the iterative purification method was unsuccessful. The DIF results were relatively consistent across two DIF …
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An in-depth analysis of DIF detection methods and equating techniques for valid test scores
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Demonstration of Interactions Among Dif Proteins and the Identification of Kapb as a Regulator of Exopolysaccharide in Myxococcus Xanthus
Myxococcus xanthus Dif proteins are chemotaxis homologues that regulate exopolysaccharide (EPS) biogenesis. Previous genetic studies suggested that Dif protein might interact with one another as do the chemotaxis proteins in enterics. The interactions among Dif proteins were since investigated with …
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Comparison of the Item Response Theory with Covariates Model and Explanatory Cognitive Diagnostic Model for Detecting and Explaining Differential Item Functioning
… in several ways, including the examination of differential item functioning (DIF). An item exhibits DIF if a subgroup has a lower probability of answering an item correctly than another subgroup after matching on academic achievement. Subgroups include race, spoken language, disability status, …
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A new dimensionality estimation tool for multiple-item tests and a new DIF analysis paradigm based on multidimensionality and construct validity
… industry today: dimensionality analysis and DIF (Differential Item Functioning) analysis. Chapter 1 develops the use of new dimensionally-sensitive proximity measures with Hierarchical Cluster Analysis and DIMTEST to estimate the dimensionality structure of tests. The results of simulation …
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Assessing Robustness of the Rasch Mixture Model to Detect Differential Item Functioning - A Monte Carlo Simulation Study
… across subgroups; in other words, the mean differences among subgroups are only due to true latent ability differences. Differential item functioning (DIF) occurs when measurement invariance is violated. There are two kinds of traditional tools for DIF detection: non-parametric methods and …
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Methods of Detecting Differential Item Functioning: A Comparison of Item Response Theory and Confirmatory Factor Analysis
<p>Differential item functioning (DIF) occurs when an item performs statistically differently for a reference group than for a focal group. DIF is a threat to the validity of a test, and it can lead to illegal usage of a test in situations such as employee selection. Thus, DIF has important …
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Differential Item Functioning Analysis of Physical Activity Disparities in the U.S
… components such as the preferred PA. By applying differential item functioning (DIF) analysis, the purpose of this study was: (a) to determine if there are any DIF items in the National Health and Nutrition Examination Survey (NHANES) PA questionnaire; (b) to identify subpopulation preferred PA; …
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Measurement equivalence of the Comprehensive Personality Scales across cultures: an item response theory approach
… framework, this study compared cross-culturally different approaches to the assessment of differential item functioning (DIF) in two personality tests of the Comprehensive Personality Scale (Wang, 2013). A dominance IRT model (SGRM) and an ideal point model (the GGUM) were applied within the NHST …
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Effect of Unequal Sample Sizes on the Power of DIF Detection: An IRT-Based Monte Carlo Study with SIBTEST and Mantel-Haenszel Procedures
… and Mantel-Haenszel procedures for detection of DIF of moderate and large magnitudes. Item parameters were estimated by, and generated with the 2PLM using WinGen2 (Han, 2006). MULTISIM was used to simulate ability estimates and to generate response data that were analyzed by SIBTEST. The SIBTEST …
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An Examination of the Improved Wald Test for Differential Item Functioning Detection with Multiple Groups
Methods for identifying items that function differentially (DIF) across groups have over time become increasingly essential for establishing validity in psychometric testing. There is a vital need for simultaneously comparing multiple groups, evidenced by the widespread proliferation of …
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Differential Item Functioning Analysis of the Herrmann Brain Dominance Instrument
Differential item functioning (DIF) is present when examinees who have the same level of a trait have a different probability of correctly answering a test item intended to measure that trait (Shepard & Averill, 1981). The following study is a DIF analysis of the Herrmann Brain Dominance Instrument …
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A Differential Item Functioning Analysis of The New Mexico English Language Proficiency Assessment
… reason, the NMELPA was investigated for group differences between those with first language origins in Spanish and Navajo, the largest groups in New Mexico. The investigation focused on the Reading and Listening subscales of the NMELPA. A Differential Item Functioning (DIF) analysis determined …
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Differential Item Functioning on the Armed Services Vocational Aptitude Battery
… Aptitude Battery (ASVAB) was examined for differential item functioning (DIF) on the basis of crossed gender and ethnicity variables. Both the Mantel-Haenszel procedure and an IRT area-based technique were utilized to assess the degree of uniform and non-uniform DIF in a sample of ASVAB …
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