To cite accumulate in publications use:

van der Loo MPJ (2025). “Split-Apply-Combine with Dynamic Grouping.” Journal of Statistical Software, 112(4), 1–21. doi:10.18637/jss.v112.i04.

Corresponding BibTeX entry:

  @Article{,
    title = {Split-Apply-Combine with Dynamic Grouping},
    author = {Mark P. J. {van der Loo}},
    journal = {Journal of Statistical Software},
    year = {2025},
    volume = {112},
    number = {4},
    pages = {1--21},
    doi = {10.18637/jss.v112.i04},
  }