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Abstract:
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Item response theory (IRT) models have been widely used in modeling educational test data. Internet consumer product ratings growing rapidly and they play an increasingly important role in consumers' purchase decisions. Such ratings data has similar structure as the educational scores data, but its matrix can be much larger and sparser. In recent years, IRT models have been applied to this type of data. In this presentation, I will first give a brief review of recent applications of IRT models to Internet consumer product ratings data, and then provide a comparison of several IRT models and estimation methods.
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