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StatControlCharts.QCXChart Function

X-Chart ("XBar Chart").

Pascal
procedure QCXChart(const Data: TMtx; const DrawVec: TVec; out CL: double; out UCL: double; out LCL: double; Confidence: double = 0.997);
Parameters 
Description 
Data 
Each Data row contains replicated observation taken at specific time. 
DrawVec 
Returns values to be drawn. 
CL 
Returns control Chart centerline. 
UCL 
Returns control Chart upper control limit. 
LCL 
Returns control Chart lower control limit. 
Confidence 
Confidence level for upper and lower control limit. Confidence must lie in the (0,1) interval. 

This routine calculates X-Chart ("XBar Chart") drawing values, center line, upper and lower control limit. 

When dealing with a quality characteristic that can be expressed as a measurement, it is customary to monitor both the mean value of the quality characteristic and its variability. Control over the average quality is exercised by the control chart for averages, usually called the XBar chart. For this chart type, the center line is defined by process grand mean and upper and lower control limits are defined by process standard deviation. Similarly, for R and S charts the center line is defined by process range and variability (standard deviation) respectively.

TQCSeries, Dew.Stats.Tee.QCSeries, QCSChart, QCRChart

The following code loads data, stored in binary file and then creates a XBar chart.

Uses StatSeries,StatControlCharts, MtxExp, Math387, MtxVecTee;
procedure Example;
var CL, UCL, LCL : double;
  Data: Matrix;
  DrawVec: Vector;
begin
  Data.LoadFromFile('ewma_data.mtx');
  QCXChart(Data,DrawVec,CL,UCL,LCL,0.025);
  // DrawVec now stores values to-be-drawn
  // CL, LCL and UCL store XBar chart center,
  // lower and upper control limits respectively.
end;
#include "MtxExpr.hpp"
#include "StatControlCharts.hpp"
#include "Math387.hpp"
void __fastcall Example();
{
  sMatrix Data;
  sVector DrawVec;
  double cl,ucl,lcl;

  Data.LoadFromFile("ewma_data.mtx");
  QCXChart(Data,DrawVec,cl,ucl,lcl,0.025);
}
Examples on GitHub
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