To cite package ‘flexmet’ in publications use:

  Feuerstahler L (2024). _flexmet: Flexible Latent Trait Metrics using
  the Filtered Monotonic Polynomial Item Response Model_. R package
  version 1.1, <https://github.com/leahfeuerstahler/flexmet>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {flexmet: Flexible Latent Trait Metrics using the Filtered Monotonic
Polynomial Item Response Model},
    author = {Leah Feuerstahler},
    year = {2024},
    note = {R package version 1.1},
    url = {https://github.com/leahfeuerstahler/flexmet},
  }