To cite package ‘opa’ in publications use:

Beechey T (2025). opa: An Implementation of Ordinal Pattern Analysis. R package version 0.8.2.033, https://github.com/timbeechey/opa.

Corresponding BibTeX entry:

  @Manual{,
    title = {opa: An Implementation of Ordinal Pattern Analysis},
    author = {Timothy Beechey},
    year = {2025},
    note = {R package version 0.8.2.033},
    url = {https://github.com/timbeechey/opa},
  }