An iterative two-stage linking procedure improves identification of DIF items¶

Claim · All claims
Evidence · 1 study · design r2 · q2
Currency · newest study 1996 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 1999: tool and model accuracy changes quickly
Evidence quality · No study behind this claim is a peer-reviewed article with a DOI: it rests on an ERIC document (a report, conference paper or thesis). It is kept because a design page cites it; treat it as a lead to check, not an established finding.

Subclaims¶

q2 i? Iterative linking, re-estimating equating after removing flagged DIF items, improves DIF identification; the study used a two-stage procedure for this reason. → Flowers 1996

Evidence¶

Flowers 1996¶

Flowers, C. P., Oshima, C., & Raju, N. (1996). A Description and Demonstration of the Polytomous-DFIT Framework. https://eric.ed.gov/?id=ED401319

q2 · i? · design · r2

Methodological claim attributed by the article to prior researchers (Lord; Drasgow; Candell & Drasgow; Lautenschlager & Park; Miller & Oshima). The study applied it: after initial linking, items with NC-DIF exceeding the critical value were removed and linking was repeated before final transformation of all items.

"Several researchers(Lord, 1980; Drasgow,1987; Candell &Drasgow, 1988;Lautenschlager & Park,1988; Miller, & Oshima,1992) have shown that aniterative linking procedureimproves identification of DIF items."

Discussion¶

Related Claims¶

• Item purification made both DIF methods more sensitive, flagging more items — related