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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. The EM algorithms are derived by Imai, Lo, and Olmsted
(2015). |
The current version is 0.0.5 (built on
3/1/15). The source code and the documentation are available for
download from The
Comprehensive R Archive Network (CRAN).
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Regardless of one's operating system, the
software can be installed by typing the following command at R
prompt: > install.packages("emIRT") This will install the latest version from CRAN. |