EWMA Chart

Example: EWMA Chart

A process is monitored using the EWMA control chart. The data is from NIST Engineering Statistics Handbook: EWMA Control Charts . This class can be used either as an applet or as an application.

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

public class EWMAEx1 extends javax.swing.JApplet {
    static private final double data[] = {
        52.0, 47.0, 53.0, 49.3, 50.1, 47.0,
        51.0, 50.1, 51.2, 50.5, 49.6, 47.6,
        49.9, 51.3, 47.8, 51.2, 52.6, 52.4,
        53.6, 52.1
    };    
       
    public void init() {
        Chart chart = new Chart(this);
        JPanelChart panel = new JPanelChart(chart);
        getContentPane().add(panel, java.awt.BorderLayout.CENTER);
        setup(chart);
    }
    
    static private void setup(Chart chart) {
        AxisXY axis = new AxisXY(chart);
        double lambda = 0.3;
        EWMA ewma = new EWMA(axis, data, lambda);
        ewma.getControlData().setMarkerColor(java.awt.Color.blue);
    }
    
    
    public static void main(String argv[]) {
        JFrameChart frame = new JFrameChart();
        EWMAEx1.setup(frame.getChart());
        frame.setVisible(true);
    }
}

Output

Link to Java source.