udPar: Representing Wei's Urn Design

In randomizeR: Randomization for Clinical Trials

Representing Wei's Urn Design

Description

Represents Wei's Urn Design.

Usage

udPar(N, ini, add, groups = LETTERS[1:2])

Arguments

N	integer for the total sample size of the trial.
ini	integer representing the initial urn composition.
add	integer representing the number of balls that are added to the urn in each step.
groups	character vector of labels for the different treatments.

Details

An urn is filled with a number of ini balls of both of the treatments. Afterwards, a ball is drawn randomly from the urn. Finally, add balls are added to the urn from the opposite treatment. This procedure is repeated until N patients are assigned.

Value

S4 object of the class udPar.

References

L.J. Wei (1977) A Class of Designs for Sequential Clinical Trials. Journal of the American Statistical Association, 72, 382-6.

See Also

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

randomizeR documentation built on Sept. 19, 2023, 1:08 a.m.