To cite package ‘OPCreg’ in publications use:

Guo G, Wei C (2026). OPCreg: Online Principal Component Regression for Online Datasets. R package version 4.0.2, https://CRAN.R-project.org/package=OPCreg.

Corresponding BibTeX entry:

  @Manual{,
    title = {OPCreg: Online Principal Component Regression for Online
      Datasets},
    author = {Guangbao Guo and Chunjie Wei},
    year = {2026},
    note = {R package version 4.0.2},
    url = {https://CRAN.R-project.org/package=OPCreg},
  }