A Simple Approach for Differential Test Functioning Based on Sum Scores
Yutaro Sakamoto, Ryuichi Kumagai · 2026
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Description
Yutaro Sakamoto and Ryuichi Kumagai propose a simple way to size group bias in a whole test, in a paper from 2026. Differential test functioning checks whether a test favors a group beyond real skill gaps, and its size reads best in raw score points.
Most gauges rest on item response theory models, which many users lack. Their Index S sorts test takers by a clean anchor score built from items not flagged for bias. It then averages the score gaps within each band, weighted by how many takers sit there. Sparse bands are merged to keep each group big enough, and a standardized form is also given. Fake-data tests with a two-parameter model, varying group size and other settings, checked how the index behaves. The tool brings bias checks within reach of plain sum scores.
Catalog record
| CREATOR | Yutaro Sakamoto, Ryuichi Kumagai |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 63795 |
| LICENSE | https://creativecommons.org/licenses/by/4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |