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This package can be cited as:

Belzak WCM (2023). “The regDIF R Package: Evaluating Complex Sources of Measurement Bias Using Regularized Differential Item Functioning.” Structural Equation Modeling: A Multidisciplinary Journal. https://doi.org/10.1080/10705511.2023.2170235.

This free open-source software implements academic research by the authors and co-workers. If you use it, please support the project by citing the appropriate journal articles.

Corresponding BibTeX entry: 

  @Article{,
    journal = {Structural Equation Modeling: A Multidisciplinary
      Journal},
    entry = {manual},
    title = {The regDIF R Package: Evaluating Complex Sources of
      Measurement Bias Using Regularized Differential Item
      Functioning},
    author = {William C. M. Belzak},
    organization = {Duolingo},
    address = {Pittsburgh, PA},
    year = {2023},
    url = {https://doi.org/10.1080/10705511.2023.2170235},
  }

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.