difNLR is an R package providing methods for detecting differential item functioning (DIF) using generalized logistic regression models. These models account for possible guessing or inattention when responding, yet remain score-based — so they require smaller sample sizes than their IRT counterparts. The package also implements a method based on a multinomial log-linear regression model for detecting differential distractor functioning (DDF). It is available on CRAN, with the latest development version on GitHub.
For a more detailed introduction, the following paper can serve as a user manual:
Hladká, A., & Martinková, P. (2020). difNLR: Generalized logistic regression models for DIF and DDF detection. The R Journal, 12(1), 300–323.
ShinyItemAnalysis (SIA) refers to a family of tools for the psychometric analysis of educational and psychological tests and their items. It comprises the interactive ShinyItemAnalysis application, along with two companion packages: SIAmodules, which extends the application with additional analytic modules, and SIAtools, which supports developers in building their own modules.
The ShinyItemAnalysis application provides a wide range of psychometric tools and is built on the free statistical software R and its Shiny package. It can be downloaded as a standard R package from CRAN and is also available online, with the latest development version on GitHub.
Visit the project web page to learn more.
The paper Martinková, P., & Drabinová, A. (2018). ShinyItemAnalysis for teaching psychometrics and to enforce routine analysis of educational tests. The R Journal, 10(2), 503–515. can serve as a user manual for the application.
For building your own modules with SIAmodules and SIAtools, see Martinková, P., Netík, J., & Hladká, A. (2026). Enhancing psychometric analysis with interactive ShinyItemAnalysis modules. Psychometrika. Online first.
The CPN (Cognitive Predictor of Neurodegeneration) application is a Shiny web tool for comparing patients' outcome measurements with the Czech normative group. It's working version is available online.