EM Algorithms for Estimating Item Response Theory Models

Various Expectation-Maximization (EM) algorithms are implemented for item response theory (IRT) models. The current implementation includes IRT models for binary and ordinal responses, along with dynamic and hierarchical IRT models with binary responses. The latter two models are derived and implemented using variational EM. Subsequent edits also include variational network and text scaling models.


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Reference manual

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install.packages("emIRT")

0.0.8 by James Lo, 3 years ago


Browse source code at https://github.com/cran/emIRT


Authors: Kosuke Imai <[email protected]> , James Lo <[email protected]> , Jonathan Olmsted <[email protected]>


Documentation:   PDF Manual  


Task views: Psychometric Models and Methods


GPL (>= 3) license


Depends on pscl, Rcpp

Linking to Rcpp, RcppArmadillo


See at CRAN