Discriminant validity is defined as the extent to which interview scores do not correlate with measures that are not theoretically related to the construct being measured; an assessment of whether a test is measuring what it was designed to measure by showing that it does not correlate with tests designed to measure different characteristics. Discriminant validity, moreover is defined as a method for establishing a test’s validity by demonstrating that its scores do not correlate with the scores of theoretically unrelated measures.
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