Full Catalog

Digital Module 01: Reliability in Classical Test Theory
​In this digital ITEMS module, Dr. Charlie Lewis and Dr. Michael Chajewski provide a two-part introduction to the topic of reliability from the perspective of classical test theory (CTT). Keywords: classical test theory, CTT, congeneric, KR-20, KR-21, Cronbach’s alpha, Pearson correlation, reliability, ​Spearman-Brown formula, parallel, tau-equivalent, test-retest, validity
Digital Module 02: Scale Reliability in Structural Equation Modeling
​In this digital ITEMS module, Dr. Greg Hancock and Dr. Ji An provide an overview of scale reliability from the perspective of structural equation modeling (SEM) and address some of the limitations of Cronbach’s α. Keywords: congeneric, Cronbach’s alpha, ​reliability, scale reliability, SEM, s​tructural equation modeling, McDonald’s omega, model fit, parallel, tau-equivalent
Digital Module 03: Nonparametric Item Response Theory
In this digital ITEMS module Dr. Stefanie Wind introduces the framework of nonparametric item response theory (IRT), in particular Mokken scaling, which can be used to evaluate fundamental measurement properties with less strict assumptions than parametric IRT models. Keywords: ​double monotonicity model, DMM, ​item response theory, IRT, Mokken scaling, monotone homogeneity model, multilevel modeling, mokken package, nonparametric IRT, ​R​, rater effects
Digital Module 04: Diagnostic Measurement Checklists
​In this digital ITEMS module, Dr. Natacha Carragher, Dr. Jonathan Templin, and colleagues provide a didactic overview of the specification, estimation, evaluation, and interpretation steps for diagnostic measurement / classification models (DCMs) centered around checklists for practitioners. A library of macros and supporting files for Excel, SAS, and Mplus is provided along with video tutorials for key practices. ​Keywords: attributes, ​checklists, ​diagnostic measurement, diagnostic classification models, DCM, Excel, ​log-linear cognitive diagnosis modeling framework, LCDM, Mplus, ​Q-matrix, model fit, SAS
Digital Module 05: The G-DINA Framework
In this digital ITEMS module, Dr. Wenchao Ma and Dr. Jimmy de la Torre introduce the G-DINA model, which is a general framework for specifying, estimating, and evaluating a wide variety of cognitive diagnosis models for the purpose of diagnostic measurement. Keywords: cognitive diagnosis models, CDM, diagnostic classification models, ​DCM, diagnostic measurement, ​GDINA, G-DINA framework, GDINA package, model fit, model comparison, Q-matrix, validation
Digital Module 06: Posterior Predictive Model Checking
​In this digital ITEMS module, Dr. Allison Ames and Aaron Myers ​discuss the most common Bayesian approach to model-data fit evaluation, which is called Posterior Predictive Model Checking (PPMC), for simple linear regression and item response theory models. Keywords: Bayesian inference, simple linear regression, item response theory, IRT, model fit, posterior predictive model checking, PPMC, Bayes theorem, Yen’s Q3, item fit