This is a brief how-to for estimating IRT models in the R packages mirt and lavaan. The example is based on a handout originally created by Lesa Hoffman but modified for my version of a course we have developed over the years. This version uses a resampled version of the original data set so as to enable my ability to post it here.
- Data: adlPermute
- R Notebook: EPSY906_Example05_Binary_IFA-IRT_Models.nb
- Lesa Hoffman’s Course Page: https://www.lesahoffman.com/PSQF6249/index.html
- Jonathan Templin’s Course Page: https://jonathantemplin.com/latent-trait-measurement-structural-equation-modeling-fall-2017-epsy-906-ku/