item discriminability

a statistical measure of how well an item on a test differentiates among subgroups of test takers, typically those individuals who possess a high degree of some ability versus those who possess a low degree of the ability. Item discriminabilities typically are given as correlation coefficients ranging from −1 to +1 in value, with the latter indicating a perfect discriminator. Interitem correlations also may be used in determining item discriminability. See item analysis.

Browse dictionary by letter

a b c d e f g h i j k l m n o p q r s t u v w x y z

Psychology term of the day

January 31st 2025

odds ratio (OR)

Sorry, "odds-ratio-or" is not in the Dictionary of Psychology. Please report to APA if you believe this is an error.