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Item Structure as a Determinant of Item Difficulty in Verbal Analogies

IN The Measurement of Intelligence (1927) E. L. Thomdike identified item difficulty (&dquo;altitude&dquo;) as the most important factor in the measurement of intellectual ability, i.e., the most important dimension (vs. range and speed) on which to scale intellectual ability. Half a century later, only limited progress has been made toward understanding the determinants of item difficulty. Campbell (1961) categorized the determinants of item difficulty into intrinsic factors, such as item content and item struc-