Differential Bundle Functioning Using the DFIT Framework: Procedures for Identifying Possible Sources of Differential Functioning

Takako C. Oshima · Nambury S. Raju · Claudia P. Flowers · Jeffrey A. Slinde

37 citations0/0 files storedApplied Measurement in Education

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Psychometric Methodologies and Testing Educational Assessment and Pedagogy Educational Technology and Assessment

Abstract

A general framework for assessing differential functioning of items and tests (DFIT) was recently proposed. Both unidimensional and multidimensional tests with either dichotomous or polytomous scoring can be handled within this framework. In this study, the DFIT framework is expanded to include differential bundle functioning (DBF) as a mechanism for identifying possible sources of differential functioning. This expansion is illustrated with an empirical (reading comprehension) data set consisting of a gender comparison and a socioeconomic status comparison with 1,000 participants in each group. Bundles on this particular test that exhibited large DBF include a reading passage that favored boys over girls, possibly due to its context. The theoretical and practical implications of the use of DFIT for identifying possible sources of differential functioning are discussed.

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References

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2009An NCME Instructional Module on Using Differential Step Functioning to Refine the Analysis of DIF in Polytomous Items 2018Model-Based Measures for Detecting and Quantifying Response Bias 2012Causes of gender DIF on an EFL language test: A multiple-data analysis over nine years 2008Using a Taxonomy of Differential Step Functioning to Improve the Interpretation of DIF in Polytomous Items: An Illustration

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