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Methods for Identifying Biased Test Items by Gregory Camilli, Lorrie Shepard (Paperback, 1994)

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ISBN-13: 9780803944169, 978-0803944169. It will certainly be referred to constantly in my future work in this area. The book concludes with a set of principles for deciding when DIF should be interpreted as evidence of bias.

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This book makes clear to researchers what item-bias methods can (and cannot) do, how they work and how they should be interpreted. Advice is provided on the most useful methods for particular test situations. The authors explain the logic of each method - from item-response theory to nonparametric, categorical methods - in terms of how differential item functioning (DIF) is defined by the method and how well the method can be expected to work. A summary of findings on the behaviour of indices in empirical studies is included. The book concludes with a set of principles for deciding when DIF should be interpreted as evidence of bias.