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What Does A Negative CPK Mean?

January 24, 2024 by Ahmed Ali

What Does A Negative CPK Mean? A negative Cpk value means the average is outside of the spec range. What if Cpk is less than 1? By convention, when the Cpk is less than one, the process is referred to as incapable. When the Cpk is greater than or equal to one, the process is

How Is Cp Calculated?

January 24, 2024 by Charlene Dyck

How Is Cp Calculated? To calculate Cp, subtract the lower specification limit from the upper specification limit, then divide by six standard deviations. What is a CP value? Cp is a ratio of the specification spread to the process spread. The process spread is often defined as the 6-sigma spread of the process (that is,