A collection of functions useful in learning and practicing IRT, which can be combined into larger programs. Provides basic CTT analysis, a simple common interface to the estimation of item parameters in IRT models for binary responses with three different programs (ICL, BILOGMG, and ltm), ability estimation (MLE, BME, EAP, WLE, plausible values), item and person fit statistics, scaling methods (MM, MS, StockingLord, and the complete Hebaera method), and a rich array of parametric and nonparametric (kernel) plots. Estimates and plots Haberman's interaction model when all items are dichotomously scored.
Package details 


Author  Ivailo Partchev [aut, cre], Gunter Maris [aut], Tamaki Hattori [ctb] 
Maintainer  Ivailo Partchev <partchev@gmail.com> 
License  GPL (>= 2) 
Version  0.2.1 
Package repository  View on CRAN 
Installation 
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