How do you calculate capability indices? Capability analysis is an essential tool for statistical process control (SPC) and ...

This is true for all negative indices. Any number or variable with a negative index, can be written as 1 over that number or variable, to the equivalent positive index. So, for example ...

Standard capability indices such as C pk are generally considered meaningful only if the process output has a normal (or reasonably normal) distribution. In practice, however, many processes have ...