To cite package ‘hbal’ in publications use:

Xu Y, Yang E (2025). hbal: Hierarchically Regularized Entropy Balancing. R package version 1.2.15, https://github.com/xuyiqing/hbal.

Corresponding BibTeX entry:

  @Manual{,
    title = {hbal: Hierarchically Regularized Entropy Balancing},
    author = {Yiqing Xu and Eddie Yang},
    year = {2025},
    note = {R package version 1.2.15},
    url = {https://github.com/xuyiqing/hbal},
  }