irtoys - A Collection of Functions Related to Item Response Theory (IRT)
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, BILOG-MG, and ltm), ability estimation (MLE, BME, EAP, WLE, plausible values), item and person fit statistics, scaling methods (MM, MS, Stocking-Lord, and the complete Hebaera method), and a rich array of parametric and non-parametric (kernel) plots. Estimates and plots Haberman's interaction model when all items are dichotomously scored.
Last updated 3 years ago
5.39 score 3 stars 5 dependents 55 scripts 497 downloadsirtrees - Estimation of Tree-Based Item Response Models
Helper functions and example data sets to facilitate the estimation of IRTree models from data with different shape and using different software.
Last updated 3 years ago
2.08 score 12 scripts 281 downloads