This function checks if TAR (treatment allocation rate) is provided. If TAR is missing, it assigns a default
equal allocation rate across all arms and ensures the TAR values correspond to the specified arm_names. It then
converts TAR to a named list for further use. Informational messages are displayed if verbose is set to TRUE.
derive_allocation_rate(TAR = NULL, arm_names, verbose = FALSE)Optional numeric vector specifying the allocation rate for each treatment arm. If missing, a default equal allocation rate is assigned.
Character vector specifying the names of the treatment arms. Used to name the elements of TAR.
Logical, if TRUE, displays messages about the status of TAR derivation or assignment.
A list representing the treatment allocation rate for each arm.