Last data update: 2014.03.03

 R: Representing Accelerated Biased Coin Design
abcdParR Documentation

Representing Accelerated Biased Coin Design

Description

Represents the randomization procedure Accelerated Biased Coin Design.

Usage

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

Arguments

N

integer for the total sample size of the trial.

a

nonnegative parameter which my be adjusted according to how strongly it is desired to balance the experiment. a = 0 gives the complete randomization, while the assignments become more deterministic as a increases.

groups

character vector of labels for the different treatments.

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.

Value

S4 object of the class abcdPar.

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

Results


Created & Maintained by Osamu Ogasawara (osamu.ogasawara@gmail.com) and IMSBIO