hIRT (0.1.1)

Hierarchical Item Response Theory Models.

http://github.com/xiangzhou09/hIRT
http://cran.r-project.org/web/packages/hIRT

Implementation of a class of hierarchical item response theory (IRT) models where both the mean and the variance of latent preferences (ability parameters) can depend on observed covariates. The current implementation includes both the two-parameter latent trait model and the graded response model. Both are fitted via the Expectation-Maximization (EM) algorithm. Asymptotic standard errors are derived from the observed information matrix.

Maintainer: Xiang Zhou
Author(s): Xiang Zhou [aut, cre]

License: GPL (>= 3)

Uses: pryr, rms, ggplot2

Released over 2 years ago.