diffIRT: Diffusion IRT Models for Response and Response Time Data
Package to fit diffusion-based IRT models to response and
response time data. Models are fit using marginal maximum
likelihood. Parameter restrictions (fixed value and equality
constraints) are possible. In addition, factor scores (person drift
rate and person boundary separation) can be estimated. Model fit
assessment tools are also available. The traditional diffusion model
can be estimated as well.
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