IRTGUI: An R Package for Unidimensional Item Response Theory Analysis With a Graphical User Interface.

In the last decade, many R packages were published to perform item response theory (IRT) analysis. Some researchers and practitioners have difficulty in using these functional tools because of their insufficient coding skills. The package provides these researchers a user-friendly GUI where they can perform unidimensional IRT analysis without coding skills. Using the package, person and item parameters, model and item fit indices can be obtained. Dimensionality and local independence assumptions can be tested. With the package, users can generate dichotomous data sets with customizable conditions. Also, Wright Maps, item characteristics and information curves can be graphically displayed. All outputs can be easily downloaded by users.