SChart is an S chart using sample standard deviations
to monitor the variability of a process.
This is normally used with sample sizes greater than 10.
Namespace:
Imsl.Chart2D.QCAssembly: ImslCS (in ImslCS.dll) Version: 6.5.0.0
Syntax
C# |
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[SerializableAttribute] public class SChart : ShewhartControlChart |
Visual Basic (Declaration) |
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<SerializableAttribute> _ Public Class SChart _ Inherits ShewhartControlChart |
Visual C++ |
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[SerializableAttribute] public ref class SChart : public ShewhartControlChart |
Remarks
The control limits are at
where is the mean of the within sample standard deviations, n is the sample size, and k is the value of the "ControlLimit" attribute for the line. Additionally, is a factor such that is an unbiased estimator of the within sample standard deviation. 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 limit lines 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..::.SChart
Imsl.Chart2D..::.AbstractChartNode
Imsl.Chart2D..::.ChartNode
Imsl.Chart2D..::.Data
Imsl.Chart2D.QC..::.ShewhartControlChart
Imsl.Chart2D.QC..::.SChart