To cite package 'OPSR' in publications use:

Heimgartner D, Wang X (2025). “OPSR: A package for estimating ordered probit switching regression models in R.” Arbeitsbericht Verkehrs- und Raumplanung 1907, IVT, ETH Zurich. doi:10.3929/ethz-b-000729641.

Wang X, Mokhtarian PL (2024). “Examining the treatment effect of teleworking on vehicle-miles driven: Applying an ordered probit selection model and incorporating the role of travel stress.” Transportation Research Part A, 186, 104072. doi:10.1016/j.tra.2024.104072.

Corresponding BibTeX entries:

  @TechReport{,
    title = {OPSR: A package for estimating ordered probit switching
      regression models in R},
    author = {Daniel Heimgartner and Xinyi Wang},
    year = {2025},
    institution = {IVT, ETH Zurich},
    type = {Arbeitsbericht Verkehrs- und Raumplanung},
    number = {1907},
    doi = {10.3929/ethz-b-000729641},
  }

  @Article{,
    title = {Examining the treatment effect of teleworking on
      vehicle-miles driven: Applying an ordered probit selection model
      and incorporating the role of travel stress},
    author = {Xinyi Wang and Patricia L. Mokhtarian},
    journal = {Transportation Research Part A},
    year = {2024},
    volume = {186},
    pages = {104072},
    doi = {10.1016/j.tra.2024.104072},
  }