Results 221 to 230 of about 183,916 (268)

An Empirical Investigation Demonstrating the Multidimensional DIF Paradigm: A Cognitive Explanation for DIF

Journal of Educational Measurement, 2001
Differential Item Functioning (DIF) is traditionally used to identify different item performance patterns between intact groups, most commonly involving race or sex comparisons. This study advocates expanding the utility of DIF as a step in construct validation.
Cindy M. Walker, S. Natasha Beretvas
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Impact of unbalanced DIF item proportions on group-specific DIF identification

Communications in Statistics - Theory and Methods, 2018
AbstractDifferences in type I error and power rates for majority and minority groups are investigated when differential item functioning (DIF) contamination in a test is unbalanced.
Ronna C. Turner, Elizabeth A. Keiffer
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Simultaneous DIF Amplification and Cancellation: Shealy‐Stout's Test for DIF

Journal of Educational Measurement, 1993
The present study investigates the phenomena of simultaneous DIF amplification and cancellation and SIBTEST's role in detecting such. A variety of simulated test data were generated for this purpose. In addition, real test data from various sources were analyzed.
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Uniform DIF and DIF Defined by Differences in Item Response Functions

Journal of Educational and Behavioral Statistics, 1998
Uniform differential item functioning (DIF) exists when the statistical relationship between item response and group is constant for all levels of a matching variable. Two other types of DIF are defined based on differences in item response functions (IRFs) among the groups of examinees: unidirectional DIF (the IRFs do not cross) and parallel DIF (the ...
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Direct induction of dictyostelium prestalk gene expression by DIF provides evidence that DIF is a morphogen

Cell, 1987
We have isolated a gene that is very rapidly induced at the transcriptional level by DIF--a low molecular weight, diffusible factor necessary for stalk cell differentiation in Dictyostelium cells developing in vitro. The gene encodes a protein containing an N-terminal signal peptide preceding approximately 70 tandem repeats of a highly conserved 24 ...
J G, Williams, A, Ceccarelli, S, McRobbie, H, Mahbubani, R R, Kay, A, Early, M, Berks, K A, Jermyn   +7 more
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Interactive DIF detection by HLM : does interacted DIF matter?

2018
Title from PDF of title page (University of Missouri--Columbia, viewed on March 10, 2010). ; The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. ; Thesis advisor: Dr. Steve Osterlind. ; M.A. University of Missouri--Columbia 2009.
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DIF Mathcad Worksheets

2013
Two Mathcad worksheets allow full mathematical follow-up of the equations given in the previous chapter. Complete calculations of the two DIF variants are given.
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Using Hierarchical Logistic Regression to Study DIF and DIF Variance in Multilevel Data

Journal of Educational Measurement, 2018
AbstractWhen contextual features of test‐taking environments differentially affect item responding for different test takers and these features vary across test administrations, they may cause differential item functioning (DIF) that varies across test administrations.
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Using the M-DIF Online Platform: A Practical Tutorial for DIF Magnitude Estimation

Educational Methods and Psychometrics
This article presents a practical tutorial for using the M-DIF online platform, a no-code interface designed to estimate the magnitude of Differential Item Functioning (DIF). The M-DIF approach defines DIF magnitude as the predicted difference in item difficulty between a focal group and a reference group.
Shan Huang, Hidetoki Ishii
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Temperatuursom of DIF ?

2004
Welke temperatuur is optimaal? Welk temperatuurverloop over de dag is het beste? Sommige telers gaan voor voornachtverlaging, anderen voor een temperatuurdip in de ochtend. In dit artikel enkele gezichtspunten omtrent de temperatuur vanuit de gewasfysiologie.
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