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Psychometric Properties of the Halstead Category Test

Using the Kuder-Richardson formula 20 (KR-20) corrected for item difficulty, the internal consistency reliability of the Halstead Category Test (HCT) was calculated for a sample (N = 398) of normal patients and volunteers, diffusely brain-damaged patients, and undiagnosed patients sent for neuropsychological assessment. The HCT Total Score reliability was .9716 and the subtest reliabilities ranged from .4587 to .9590. An item analysis found that most of the test items, except for those from Subtests I and II, were within established criteria for item difficulty and the discrimination index.