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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

December 22nd 2024

Machiavellianism

Machiavellianism

n. a personality trait marked by a calculating attitude toward human relationships and a belief that ends justify means, however ruthless. A Machiavellian is one who views other people more or less as objects to be manipulated in pursuit of his or her goals, if necessary through deliberate deception. [Niccolò Machiavelli, who argued that an effective ruler must be prepared to act in this way]