abcdPar function

Representing Accelerated Biased Coin Design

Represents the randomization procedure Accelerated Biased Coin Design.

abcdPar(N, a, groups = LETTERS[1:2])

Arguments

• N: integer for the total sample size of the trial.
• a: nonnegative parameter which controls the degree of randomness: For decreasing a the allocations become deterministic, while for increasing a the randomization procedure tends to complete randomization.
• groups: character vector of labels for the different treatments.

Returns

S4 object of the class abcdPar.

Details

This is a class of 'biased coins' where the probability of selecting the under-represented treatment is dependent from the absolute difference between the two treatment allocations up to the current step.

References

A. B. Antognini and A. Giovagnoli (2004) A new 'biased coin design' for the sequential allocation of two treatments. Journal of the Royal Statistical Society. Series C (Applied Statistics)

53 , No. 4, 651-664

See Also

Other randomization procedures: bbcdPar, bsdPar, chenPar, crPar, createParam(), ebcPar, gbcdPar, hadaPar, mpPar, pbrPar, rarPar, rpbrPar, rtbdPar, tbdPar, udPar