To cite package ‘testtwice’ in publications use:

  Rosenbaum PR (2020). _testtwice: Testing One Hypothesis Twice in
  Observational Studies_. R package version 1.0.3,
  <https://CRAN.R-project.org/package=testtwice>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {testtwice: Testing One Hypothesis Twice in Observational Studies},
    author = {Paul R. Rosenbaum},
    year = {2020},
    note = {R package version 1.0.3},
    url = {https://CRAN.R-project.org/package=testtwice},
  }

ATTENTION: This citation information has been auto-generated from the
package DESCRIPTION file and may need manual editing, see
‘help("citation")’.