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CHAPTER 3 Estimating Item Parameters - EdRes.org

Chapter 3: Estimating Item Parameters 49 FIGURE 3-2. Item characteristic curve fitted to observed proportions of correct response χ θθ θθ 2 1 2 = − = ∑m pP PQ j j J jj jj [( ) ( )] () values of the item parameters were b = -.39 and a = 1.27. An important consideration within item response theory is whether a

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