This function conducts validity check and generates a matrix with two binary variables indicating
if the observation belongs to the external trial
if the observation belongs to the treatment arm.
Arguments
- ssC
Number of observations in the internal control arm. Default is 100
- ssE
Number of observations in the internal experiment arm. Default is the same number
of observations as ssC
- ssExt
Number of observations in the external control arm. Default is the same number
of observations as ssC
Value
A matrix containing external trial indicator and treatment indicator