Multivariate Methods • Item Analysis • Statistical Details for the Item Analysis Platform
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Statistical Details for the Item Analysis Platform
Item response theory (IRT) uses a series of equations to relate items to an unobserved (latent) trait or ability. Items, or questions, are indicators of an underlying latent construct that cannot be directly observed. At the time of data collection, both the subject abilities and the item characteristics are unknown.
 
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Item Response Curves
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Item Response Curve Models
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IRT Model Assumptions
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Fitting the IRT Model
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Ability Formula

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Help created on 7/12/2018