To cite package ‘Qindex’ in publications use:

  Zhan T, Yi M, Chervoneva I (2024). _Qindex: Continuous and
  Dichotomized Index Predictors Based on Distribution Quantiles_. R
  package version 0.1.7, <https://CRAN.R-project.org/package=Qindex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Qindex: Continuous and Dichotomized Index Predictors Based on
Distribution Quantiles},
    author = {Tingting Zhan and Misung Yi and Inna Chervoneva},
    year = {2024},
    note = {R package version 0.1.7},
    url = {https://CRAN.R-project.org/package=Qindex},
  }