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XbarSCapabilityIndexCpk Method
Returns the capability index c_{pk}.

Namespace: Imsl.Chart2D.QC
Assembly: ImslCS (in ImslCS.dll) Version: 6.5.2.0
Syntax
public virtual double CapabilityIndexCpk(
	double lowerSpecificationLimit,
	double upperSpecificationLimit
)

Parameters

lowerSpecificationLimit
Type: SystemDouble
The lower specification limit.
upperSpecificationLimit
Type: SystemDouble
The upper specification limit.

Return Value

Type: Double
The capability index c_{pk}.
Remarks
The capability index is
c_{pk}=\min\left[\frac{\mathrm{USL}-\bar{x}}{3\sigma},\frac{\bar{x}-\mathrm{LSL}}{3\sigma}\right]
where LSL and USL are the lower and upper specification limits, \bar{x} is the center line, and
\sigma=\frac{\bar{s}}{c_{4,n}\sqrt{n}}
.
See Also