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In item response theory, the relationship between a latent ability ( ... ) and the probability of a correct response ( ... ) on a test item is modelled by an item characteristic curve. This Demonstration plots the item characteristic curve of a single dichotomous item under two different models: the normal ogive model and the logistic model. The parameters ... , ... , and ... represent item properties related to discrimination, difficulty, and guessing. The constant ... is used to scale the logistic curve. Notice that the two curves are nearly identical when ... .
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