What is Process capability index (Cpk)?
An index of how much margin a process's variation and mean offset leave relative to the specification limits. A common benchmark is 1.33 or higher.
Field: Yield and quality control
Process capability index (Cpk) in the explanations
When the mean is off the specification center, Cpk, which accounts for the offset, is used.
Which formula gives the process capability index Cp (when t…Cp assumes the mean is at the center of the specification, whereas Cpk is obtained by dividing the distance from the mean to the nearer specification limit by 3σ, so it accounts for the offset.
Which process capability index is used when the process mea…FIT is a failure rate over time, and Cp is a process capability index.
Which quality metric expresses the number of defects per mi…
Questions that mention Process capability index (Cpk) (3)
- Which formula gives the process capability index Cp (when the process mean coincides with the center of the specification)? (σ: process standard deviation)
- Which process capability index is used when the process mean is offset from the center of the specification?
- Which quality metric expresses the number of defects per million shipped products?
Related terms
APC (advanced process control) Cause-and-effect diagram Control chart FMEA (failure mode and effects analysis) Killer defect Pareto chart Poisson yield model SPC (statistical process control) Systematic defect Yield