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);

    }

}

 

 

 

 

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