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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.


Additional Resources:

  • Lesa Hoffman’s Course Page:
  • Jonathan Templin’s Course Page: