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.

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Psychology term of the day

March 15th 2025

tissue

n. a structure composed of identical or similar cells with the same or similar function, as in adipose tissue, erectile tissue, or muscle tissue.