Item Response Theory (IRT)
A family of statistical models used to analyze the relationship between individuals� performance on a test item and their overall performance on a test, often used in survey design.
Implications
A statistical framework used to model the relationship between an individual�s latent traits (e.g., ability, attitude) and their responses to specific items on a test or survey, often used in educational testing, psychology, and survey research to improve the accuracy and reliability of measurements.
Example
Example: An educational testing company uses Item Response Theory to design standardized tests, ensuring that each question accurately reflects the test-taker�s underlying ability and that the test is fair across different populations.
Related Terms
Different from classical test theory, which assumes that each test item has the same level of difficulty for all test-takers, IRT models the probability of a correct response based on both the item�s properties and the individual�s traits.
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