Similarities
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The relationship of derived scores is the same, e.g.,
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High correlation, (0.95) of number right scores and scale scores
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Scale score has the same percentile rank for both methods
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Differences
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Methods of deriving scores
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The number of scale scores possible
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Number right = limited to the number of items
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IRT = unlimited or is limited by the scale (ex. 100-500)
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