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If you wish to report a bug, or if you are interested in having us mirror your free-software or open-source project, please feel free to contact us at mirror[@]metanet.ch.

To cite OptGS in publications use:

1. James M. S. Wason (2015). “OptGS: An R Package for Finding Near-Optimal Group-Sequential Designs.” Journal of Statistical Software, 66(2), 1–13. https://www.jstatsoft.org/v66/i02/.

Corresponding BibTeX entry: 

  @Article{,
    title = {{OptGS}: An {R} Package for Finding Near-Optimal
      Group-Sequential Designs},
    author = {{James M. S. Wason}},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {66},
    number = {2},
    pages = {1--13},
    url = {https://www.jstatsoft.org/v66/i02/},
  }

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.