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What is Item Response Theory (IRT) and why was Reading Comprehension changed to use it?

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What is Item Response Theory (IRT) and why was Reading Comprehension changed to use it?

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IRT allowed us to weigh each item in the grade level for difficulty. The difficult items for age 6 are the easy items for age 7. IRT was a statistical method that allowed us to represent these differences and ensure that scores were not being underestimated for the lower functioning students.

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