Title: Interactive and Step by Step Analyses of Test and Item Properties with
"difNLR" and "ShinyItemAnalysis"

Authors: Patricia Martinkova, Adela Drabinova, Jakub Houdek

Affiliation: Institute of Computer Science, Czech Academy of Sciences

Abstract: 
This talk introduces two R packages used for step by step instruction on
psychometric models: Package "ShinyItemAnalysis" is used for interactive
analysis of test and item properties with R. Starting with traditional methods,
it moves through regression models with different parametrizations to IRT
models. Methods for detection of differential item functioning (DIF) are then
presented as further extension of these models. Part of DIF detection methods -
those based on generalizations of logistic regression models - are provided by
package "difNLR", also presented in this talk.