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A Comparison of Aggregation Rules for Selecting Anchor Items in Multi Group DIF Analysis

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author HuelmannThorben, DebelakRudolf, Strobl Carolin ,
Project Detecting Heterogeneity in Complex IRT Models for Measuring Latent Traits
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Original article (peer-reviewed)

Journal Journal of Educational Measurement
Title of proceedings Journal of Educational Measurement

Open Access

Type of Open Access Repository (Green Open Access)


Anchoring is an important issue for differential item functioning (DIF) analysis. This article investigates how to use anchoring in multi group scenarios. A direct approach and three aggregation rules to translate anchor selection methods for two group scenarios to multi group scenarios are compared. Two simulation studies were conducted. The results indicate that the aggregation rules come to comparable results, while the direct approach has no substantial advantage over the aggregation rules. In the discussion, practical advice for using anchor selection methods in multi group scenarios is given.