QCCapIndexes Routine

Summary

Calculates the Process Capability indexes p, Cp and Cpk.

Declaration

Procedure QCCapIndexes(Data: TVec; LB, UB: TSample; out p, CP, CPK: TSample; out CPConfInt, CPKConfInt: TTwoElmReal; Alpha: TSample = 0.05);

Parameter	Description
Data	Process data.
LB,UB	Lower and upper specification limit. LB and UB are boundaries within which measurements on a product characteristic must lie.
Alpha	Desired significance level.
p	Returns calculated significance.
CP	Returns capability index.
CPConfInt	Returns 100*(1-Alpha) Cp confindence interval.
CPK	Returns capability index for uncentred process.
CPKConfInt	Returns 100*(1-Alpha) CPK confidence interval.

Description

Calculates the Process Capability indexes p, Cp(aka CPR) and Cpk(AKA CPRk).

Example 1

In the following example capability indexes and their condifence are calculated.

  Uses StatControlCharts, MtxExp, Math387;
  procedure Example;
  var Data: Vector;
      p, lb, ub,cp, cpk: TSample;
      CPConfInt, CPKConfInt: TTwoElmReal;
  begin
    Data.LoadFromFile('PCDATA.vec');
    QCCapIndexes(Data,lb,ub,p,cp,cpk,CPConfInt,CPKConfInt, 0.05);
  end;

  #include "MtxVecCpp.h"
  #include "StatControlCharts.hpp"
  #include "Math387.hpp"
  void __fastcall Example();
  {
    Vector Data;
    double p, lb, ub,cp, cpk;
    double[] CPConfInt = new double[2];
    double[] CPKConfInt = new double[2];
    Data->LoadFromFile("PCDATA.vec");
    QCCapIndexes(Data,lb,ub,p,cp,cpk,CPConfInt,CPKConfInt, 0.05);
  }

  using Dew.Math;
  using Dew.Math.Units;
  using Dew.Stats.Units;
  namespace Dew.Examples
  {
    private void Example()
    {
      Vector data = new Vector(0);
      data.LoadFromFile("PCDATA.vec");
      StatControlCharts.QCCapIndexes(Data,out lb,out ub,out p,out cp,out cpk,out CPConfInt,out CPKConfInt, 0.05);
    }
  }