What does the slope of an Item Characteristic Curve (ICC) indicate?
Understand the Problem
The question is asking about the implications of the slope of an Item Characteristic Curve (ICC) in the context of testing and measurement theory, specifically relating to item response theory.
Answer
The slope of an ICC indicates the discrimination of an item.
The slope of an Item Characteristic Curve (ICC) indicates the discrimination of an item. A steeper slope means the item discriminates well among test takers, while a flatter slope indicates poor discrimination.
Answer for screen readers
The slope of an Item Characteristic Curve (ICC) indicates the discrimination of an item. A steeper slope means the item discriminates well among test takers, while a flatter slope indicates poor discrimination.
More Information
In the context of Item Response Theory (IRT), the slope, also known as the discrimination parameter, determines how well an item can distinguish between individuals with different underlying abilities or traits.
Tips
A common mistake is confusing the slope with the difficulty of the item, which is more related to where the curve is located on the ability scale.
Sources
- What is an Item Characteristic Curve (ICC)? - brght.org
- Item Response Theory - publichealth.columbia.edu
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