## Methods for identifying biased test itemsThis 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. |

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### Contents

Test Bias Item Bias and Test Validity | 1 |

Early Item Bias Indices Based on Classical Test Theory | 22 |

Item Response Theory as Applied | 46 |

Copyright | |

3 other sections not shown

### Other editions - View all

Methods for Identifying Biased Test Items Gregory Camilli,Lorrie A. Shepard,Lorrie Shepard Limited preview - 1994 |

### Common terms and phrases

ability analysis Angoff ANOVA approach augmented model biased items BILOG Camilli Chapter chi-square classical classical test theory conceptual construct contingency table correct response correlations detecting bias detecting DIF DIF analyses DIF indices DIF statistics differential difficulty differential item functioning Educational Educational Testing Service equation example Figure group differences group mean Hambleton ICCs interaction interpretation IRT methods IRT model item bias procedures item characteristic curves item discrimination item response theory LARGEST CHANGE LOG LIKELIHOOD logistic regression Mantel-Haenszel math measures of DIF minority group model comparison multidimensionality null hypothesis odds ratio p-value differences performance point biserial predictive probability difference proportion correct Rasch model Reference and Focal Reference group relative sample scale Shepard showing DIF significant DIF standard SUBTEST test bias test items TF TF TF TT TF Thissen total score total test score transformed item difficulty TT TT TT Type I error validity variable