UChart is a u-chart for monitoring the defect rate when
defects are rare.
Namespace:
Imsl.Chart2D.QCAssembly: ImslCS (in ImslCS.dll) Version: 6.5.0.0
Syntax
C# |
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[SerializableAttribute] public class UChart : ShewhartControlChart |
Visual Basic (Declaration) |
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<SerializableAttribute> _ Public Class UChart _ Inherits ShewhartControlChart |
Visual C++ |
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[SerializableAttribute] public ref class UChart : public ShewhartControlChart |
Remarks
The defect rate is the number of defects found divided by the number of samples inspected. The number of defects are assumed to be rare. Control limits are computed using the Poisson distribution. If defects are not rare, use PChart instead. The sample sizes are not required to be equal.
The control limits are at
where is the observed average number of defects per unit, n is the number of inspection units, and k is the value of the "ControlLimit" attribute for the line. By default, the chart contains an upper control limit line with k=3, a lower control limit line with k=-3, and a central line equal to . Additional control limits can be added. The method AddWeco adds control limits with k = -2, -1, 1, 2.Inheritance Hierarchy
System..::.Object
Imsl.Chart2D..::.AbstractChartNode
Imsl.Chart2D..::.ChartNode
Imsl.Chart2D..::.Data
Imsl.Chart2D.QC..::.ShewhartControlChart
Imsl.Chart2D.QC..::.UChart
Imsl.Chart2D..::.AbstractChartNode
Imsl.Chart2D..::.ChartNode
Imsl.Chart2D..::.Data
Imsl.Chart2D.QC..::.ShewhartControlChart
Imsl.Chart2D.QC..::.UChart