1. Difference between cp, cpk and pp, Ppk ?

Question

Accepted Answer

Cp, Cpk, Pp, and Ppk are statistical process capability indices used to measure the ability of a process to produce products within specification limits.

Cp and Cpk are used for short-term process capability analysis, while Pp and Ppk are used for long-term process capability analysis.
Cp measures the potential capability of a process to meet specifications, while Cpk measures the actual capability of a process to meet specifications considering the process mean and variation.
Pp measures the potential capability of a process to meet specifications, while Ppk measures the actual capability of a process to meet specifications considering the process mean and variation.
Cp and Pp are calculated using the standard deviation, while Cpk and Ppk are calculated using the standard deviation and the deviation from the target value.
A higher value of Cp, Cpk, Pp, or Ppk indicates a better process capability.
Example: If Cp is 1.5, it means the process is capable of producing products within 1.5 times the specification limits.

Accepted Answer

The different between pp

1. Difference between cp, cpk and pp, Ppk ?

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