Represents the randomization procedure Accelerated Biased Coin Design.
abcdPar(N, a, groups = LETTERS[1:2])
S4
object of the class abcdPar
.
integer for the total sample size of the trial.
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.
character vector of labels for the different treatments.
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.
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
Other randomization procedures:
bbcdPar
,
bsdPar
,
chenPar
,
crPar
,
createParam()
,
ebcPar
,
gbcdPar
,
hadaPar
,
mpPar
,
pbrPar
,
rarPar
,
rpbrPar
,
rtbdPar
,
tbdPar
,
udPar