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JMP 12 Consumer Research by SAS Institute

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Chapter 7 
Item Analysis
Analyze Test Results by Item and Subject
Item Response Theory (IRT) is a method of scoring tests. Although classical test theory methods have been widely used for a century, IRT provides a better and more scientifically based scoring procedure.
Its advantages include:
Scoring tests at the item level, giving insight into the contributions of each item on the total test score.
Producing scores of both the test takers and the test items on the same scale.
Fitting nonlinear logistic curves, more representative of actual test performance than classical linear statistics.
Figure 7.1 Item Analysis Example
Item Analysis Example

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