Category: Accuracy (Discriminant Accuracy)

Accuracy describes a measure’s ability to approach the true value of the quantity being measured. Any measure has the capacity for error due to variables and conditions. For example, a scale may not be very accurate if the spring it uses is old and not as flexible as it originally was. In language testing, a test has diagnostic accuracy if it is able to distinguish between typically developing and language impaired individuals with a high degree of accuracy (at least 80% of the time).