In classical test theory, the concept of reliability is used to quantify measurement precision. In IRT, the analogous concept is called _________.

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In Item Response Theory (IRT), the concept analogous to reliability in classical test theory is referred to as "information." Specifically, it's about how much information an item or a test provides about the underlying trait (e.g., ability) being measured.

In Classical Test Theory, the Concept of Reliability Is Used