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A Practical Response Adaptive Block Randomization (RABR) Design with Analytic Type I Error Protection

To evaluate type I error rate, power, and operating characteristics of RABR via simulations.

Installation

You can install the released version of RABR from CRAN with:

install.packages("RABR")

Example

We provide an example of RABR with a continuous endpoint. One may refer to the vignette for more details.

library(RABR)
library(parallel)
library(doParallel)
#> Loading required package: foreach
#> Loading required package: iterators
RABR.fit = RABRcontinuous(
            MeanVec = c(0.43, 0.48, 0.63, 1.2),
            SdVec = c(1, 1, 1, 1),
            M = 60,
            N = 120,
            R = c(8, 9, 2, 1),
            Nitt = 1000,
            Alpha = 0.025,
            Ncluster = 2,
            Seed = 12345,
            MultiMethod = "dunnett")
##
## Probability of rejecting each elementary null
## hypothesis without multiplicity adjustment
   print(RABR.fit$ProbUnadj)
#> [1] 0.027 0.093 0.877
##
## Probability of rejecting each elementary null
## hypothesis with multiplicity adjustment
   print(RABR.fit$ProbAdj)
#> [1] 0.017 0.062 0.804
##
## Probability of selecting and confirming the
## efficacy of each active treatment group
   print(RABR.fit$ProbAdjSelected)
#> [1] 0.001 0.007 0.802
##
## ProbAdjOverall Probability of rejecting at
## least one elementary null hypothesis
## with multiplicity adjustment
   print(RABR.fit$ProbAdjOverall)
#> [1] 0.81
##
## ASN Average sample size of placebo and active
## treatment groups
   print(RABR.fit$ASN)
#> [1] 39.107 40.746 21.432 18.715

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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