JMSL Chart Guide: CuSum

JMSL Chart Programmer's Guide

Quality Control and Improvement Charts >> CuSum

CuSum

CuSum is the cumulative sum control chart. It plots the cumulative sum of the deviations of the expected value. If is the expected mean for a process and are the sample means then the cumulative sum is

CuSum Example

The data used is the same as for the EWMA example.

(Download Code)

import com.imsl.chart.*;
import com.imsl.chart.qc.*;

public class SampleCuSum extends JFrameChart {        
    public SampleCuSum() {
        Chart chart = getChart();
        AxisXY axis = new AxisXY(chart);
        CuSum cusum = new CuSum(axis, SampleEWMA.data);
        cusum.setExpectedMean(10.0);
        
        axis.getAxisX().getAxisTitle().setTitle("Sample Number");
        axis.getAxisX().getAxisLabel().setTextFormat("0");
        axis.getAxisY().getAxisTitle().setTitle("CuSum");
    }
        
    public static void main(String argv[]) {
        new SampleCuSum().setVisible(true);
    }
}