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This book makes clear to researchers what itembias 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 itemresponse 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.
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