bcdalloc: Biased Coin Design Allocation

Description Usage Arguments Value Author(s) References Examples

View source: R/bcdalloc.R

Description

Allocates observations sequentially using a biased coin design. If equal numbers have been allocated to treatment and control, the next observation is allocated to treatment with probability 1/2. If there are more units assigned to treatment than control, the next observation is allocated to control with probability p; if there are more units assigned to control than treatment, the next observation is allocated to treatment with probability p.

Usage

1
bcdalloc(n, pbcd, tol = 1e-06)

Arguments

n

number of observations

pbcd

probability p used for biased coin

tol

tolerance used for allocation

Value

Vector of zeroes and ones indicating the allocation of each unit to treatment (1) or control (0)

Author(s)

Xiaoshu Zhu [email protected] and Sharon Lohr

References

Efron, B. (1971). Forcing a sequential experiment to be balanced. Biometrika, 58(3), 403-417.

Lohr, S. and X. Zhu (2015). Randomized Sequential Individual Assignment in Social Experiments: Evaluating the Design Options Prospectively. Sociological Methods and Research. [Advance online publication: December 27, 2015] doi: 10.1177/0049124115621332.

Examples

1
bcdalloc(20,0.7)

SeqAlloc documentation built on May 30, 2017, 6:30 a.m.