Returns the capability index 
.
Namespace:
Imsl.Chart2D.QC.
Assembly: ImslCS (in ImslCS.dll) Version: 6.5.0.0
Syntax
| C# |
|---|
public virtual double CapabilityIndexCpk( double lowerSpecificationLimit, double upperSpecificationLimit ) |
| Visual Basic (Declaration) |
|---|
Public Overridable Function CapabilityIndexCpk ( _ lowerSpecificationLimit As Double, _ upperSpecificationLimit As Double _ ) As Double |
| Visual C++ |
|---|
public: virtual double CapabilityIndexCpk( double lowerSpecificationLimit, double upperSpecificationLimit ) |
Parameters
- lowerSpecificationLimit
- Type: System..::.Double
The lower specification limit.
- upperSpecificationLimit
- Type: System..::.Double
The upper specification limit.
Return Value
The capability index.
Remarks
The capability index is
![c_{pk}=\min\left[\frac{\mathrm{USL}-\bar{x}}{3\sigma},\frac{\bar{x}-\mathrm{LSL}}{3\sigma}\right]](eqn/eqn_0077.png)
where LSL and USL are the lower and upper specification limits,
is the center line, and
.
is the center line, and
