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To cite APD, please use:

Merino-Soto C (2026). “Response consistency for short scale items: R package for implementation of the average proportional distance.” Ciencias Psicológicas.

Merino-Soto C (2026). APD: Average Proportional Distance for Item Analysis from Scales. R package version 1.0.1, https://github.com/cmerinos/APD.

Corresponding BibTeX entries: 

  @Article{,
    title = {Response consistency for short scale items: R package for
      implementation of the average proportional distance},
    author = {César Merino-Soto},
    year = {2026},
    journal = {Ciencias Psicológicas},
  }

  @Manual{,
    title = {APD: Average Proportional Distance for Item Analysis from
      Scales},
    author = {César Merino-Soto},
    year = {2026},
    note = {R package version 1.0.1},
    url = {https://github.com/cmerinos/APD},
  }

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.