Pp·Ppk
Process performance indices
PpPpk
Pp and Ppk are process performance indices that summarize spread and mean position relative to specifications using the standard deviation of the entire specified dataset.
Other learning contexts (1)
In context
In practice, Cp and Cpk often use estimated within-subgroup dispersion, while Pp and Ppk use overall dispersion. Check the software's calculation definitions.
Example
If the mean shifts between shifts, overall dispersion may exceed within-subgroup dispersion.
Key distinction
Calculating Pp and Ppk does not make the future of an unstable process predictable.
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