Scholary papers describing the methodology

The multcomp package implements multiplicity-adjusted tests and simultaneous confidence intervals for linear combinations of model parameters using methodology described in Hothorn, Bretz, and Westfall (2008) and the book by Bretz, Hothorn, and Westfall (2010).

References

[1] T. Hothorn, F. Bretz, and P. Westfall. “Simultaneous Inference in General Parametric Models”. In: Biometrical Journal 50.3 (2008), pp. 346–363. DOI: 10.1002/bimj.200810425.

[2] F. Bretz, T. Hothorn, and P. Westfall. Multiple Comparisons Using R. Boca Raton, Florida, USA: Chapman & Hall/CRC Press, 2010. ISBN: 978–1–58488–574–0.