Represents the Truncated Binomial Design.
vector which contains the lengths
character vector of labels for the different treatments.
A fair toin is tossed until half of the patients have been assigned to one of the treatment arms. Afterwards, the randomization list is filled with the other treatment.
S4 object of the class
W. F. Rosenberger and J. M. Lachin (2002) Randomization in Clinical Trials. Wiley.