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In This Chapter
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Assessing Person Fit in Typical-Response Measures
- Introduction
- Assessing Person Fit in Typical-Response Measures
- Review of the Models and Needed Results
- Research Methods
- Current Person Fit Methods
- Practical Indices
- Expected Behavior of Practical Indices with Different Types of Inconsistency
- Person Unreliability (Ferrando, 2004; Lumsden, 1977)
- Multidimensionality and Idiosyncratic Responding
- Faking
- Acquiescence
- Sabotaging/Malingering
- Extreme and Middle Responding
- Specific Indices: Optimal Indices
- Graphical Procedures
- Graphical Procedures for Binary Responses
- Graphical Procedures for Continuous Responses
- Graphical Procedures for Graded Responses
- Graphical Assessment of Different Types of Inconsistency
- Scalar Valued Item-Level Indices
- Application
- Future Directions
- References
Abstract
The fit of an item response theory (IRT) model to the data is usually assessed by considering the entire sample of test respondents (Chapter 6). Overall model-data fit is assessed by jointly considering all the items × individuals responses. At a more specific level, item fit is assessed on an item-by-item basis by considering the item responses across the group of respondents.
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