CuSumStatus is a tabular or status CuSum chart. The tabular CuSum statistics are
By default, both statistics have initial value zero. The
parameter K is the slack value (or allowance or reference value) and
is the expected
mean.
The CuSumStatus
chart contains two bar charts: a bar chart of 
above the x-axis and a bar chart of 
below the x-axis. There are also control limits at
plus and minus H. The value of H can be set either as an absolute
value or as a relative value h. They are related by 
, where 
is the standard
deviation. By default, bars which are out-of-control are filled red while
in-control bars are green. The data is also plotted on the chart.
The CuSumStatus
has a print method to print the and values as well as 
and 
, where is the number of consecutive periods since rose above zero.
CuSumStatus Example
This example uses the same data as used for the CuSum
and EWMA
examples. In this example 
.
import com.imsl.chart.*;
import com.imsl.chart.qc.*;
public class SampleCuSumStatus extends JFrameChart {
public SampleCuSumStatus() {
double expectedMean = 10;
double slackValue = 0.5;
Chart chart = getChart();
AxisXY axis = new AxisXY(chart);
CuSumStatus cusumStatus = new CuSumStatus(axis,
SampleEWMA.data, expectedMean, slackValue);
cusumStatus.setRelativeH(4);
cusumStatus.print();
axis.getAxisX().getAxisTitle().setTitle("Sample Number");
axis.getAxisX().getAxisLabel().setTextFormat("0");
axis.getAxisY().getAxisTitle().setTitle("C+ / C-");
axis.getAxisX().setWindow(0, 30);
axis.getAxisX().setAutoscaleInput(0);
cusumStatus.addDataMarkers();
cusumStatus.getDataMarkers().setMarkerSize(0.5);
cusumStatus.getDataMarkers().setMarkerColor(java.awt.Color.blue);
Axis1D axisY = cusumStatus.getDataMarkersAxis().getAxisY();
axisY.getAxisTitle().setTitle("Original Data");
}
public static void main(String argv[]) {
new SampleCuSumStatus().setVisible(true);
}
}
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