To cite package ‘formulaiv’ in publications use:

  Sheng P (2026). _formulaiv: Sensitivity of Formula Instrument to
  Shock Design_. R package version 0.1.0,
  <https://CRAN.R-project.org/package=formulaiv>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {formulaiv: Sensitivity of Formula Instrument to Shock Design},
    author = {Peizan Sheng},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=formulaiv},
  }