Example: S Chart

During a manufacturing process 15 samples, each containing up to 12 items, were measured. An S chart was contructed from the 15 sample standard deviations. Since the sample sizes are unequal the upper and lower control limit lines are stair step lines.

This class can be used either as an applet or as an application.

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

public class SChartEx1 extends javax.swing.JApplet {
    static private final double data[][] = {
        {23.97, 24.08, 23.16, 23.49, 24.73, 25.26, 22.97, 23.12, 24.66, 24.20, 24.62, 24.56},
        {24.20, 24.50, 23.45, 24.05, 23.75, 23.89, 24.83, 25.21, 23.70},
        {23.73, 22.70, 23.54, 24.37, 23.74, 24.08, 23.95, 24.20, 23.43, 24.26, 23.61},
        {23.46, 23.14, 23.73, 24.29, 24.13, 23.62, 24.08, 23.73, 23.91, 23.65},
        {23.95, 22.95, 24.72, 24.40, 22.82, 22.66, 22.71, 23.41, 22.56},
        {24.13, 24.28, 23.84, 24.55, 22.58, 24.47, 23.63, 22.64, 24.12},
        {23.69, 24.19, 24.76, 23.83, 22.60, 24.35, 22.96, 23.81, 23.46},
        {24.35, 23.11, 25.24, 24.10, 23.47, 23.55, 23.91, 24.08, 22.45, 24.13},
        {24.98, 24.58, 23.52, 23.55, 23.67, 24.25, 23.85, 23.08, 23.44, 23.43},
        {23.90, 24.04, 24.29, 23.62, 23.29, 23.16, 24.34, 24.37, 24.19, 24.33, 22.17, 23.66},
        {23.51, 23.87, 23.29, 23.96, 23.06, 23.47, 23.53, 22.87, 23.38, 22.86},
        {23.13, 23.17, 23.40, 23.68, 23.37, 24.40, 24.64, 24.16, 24.17, 23.88},
        {23.52, 24.23, 24.25, 23.83, 22.82, 23.93, 23.55, 23.40},
        {23.66, 23.59, 23.79, 24.07, 23.65, 23.73, 25.12, 23.65, 23.23, 23.13},
        {23.04, 23.75, 22.84, 23.46, 21.72, 24.73, 23.88, 23.34, 24.98}
    };    
    
    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);
       new SChart(axis, data);
    }
    
    
    public static void main(String argv[]) {
        JFrameChart frame = new JFrameChart();
        SChartEx1.setup(frame.getChart());
        frame.setVisible(true);
    }
}

Output

eqn_0378

Link to Java source.