To cite cuperdec in publications use:

Yates JAF (2020). cuperdec: cumulative percent decay curves. https://github.com/jfy133/cuperdec.

Corresponding BibTeX entry:

  @Manual{,
    title = {cuperdec: cumulative percent decay curves},
    author = {James A. Fellows Yates},
    year = {2020},
    url = {https://github.com/jfy133/cuperdec},
  }