Finally, we analyze the relative biases when the process is
off-center and data are selected from the Normal distribution.
We observed that the values of RB based on the off-center process
are similar, respectively, to the values of RB based on the
cases where the process is centered and data are also selected
from the Normal distribution. This issue indicates that the
impact on the various estimators of Cpk and r is not relevant
if we consider off-center processes.