StatControlCharts.QCXChart Method

X-Chart ("XBar Chart").

Syntax

Visual Basic

public static void QCXChart([In] TMtx Data, [In] TVec DrawVec, out double CL, out double UCL, out double LCL, double Confidence);

Parameters

Parameters	Description
[In] TMtx Data	Each Data row contains replicated observation taken at specific time.
[In] TVec DrawVec	Returns values to be drawn.
out double CL	Returns control Chart centerline.
out double UCL	Returns control Chart upper control limit.
out double LCL	Returns control Chart lower control limit.
double Confidence	Confidence level for upper and lower control limit. Confidence must lie in the (0,1) interval.

Remarks

This routine calculates X-Chart ("XBar Chart") drawing values, center line, upper and lower control limit.

When dealing with a quality characteristic that can be expressed as a measurement, it is customary to monitor both the mean value of the quality characteristic and its variability. Control over the average quality is exercised by the control chart for averages, usually called the XBar chart. For this chart type, the center line is defined by process grand mean and upper and lower control limits are defined by process standard deviation. Similarly, for R and S charts the center line is defined by process range and variability (standard deviation) respectively.

Example

The following code loads data, stored in binary file and then creates a XBar chart.

using Dew.Math; using Dew.Math.Units; using Dew.Stats.Units; namespace Dew.Examples { private void Example() { Matrix Data; Vector DrawVec; double cl,ucl,lcl; Data.LoadFromFile("ewma_data.mtx"); StatControlCharts.QCXChart(Data,DrawVec,out cl, out ucl, out lcl, 0.025); } }

Group

StatControlCharts Methods

Links

StatControlCharts Class, StatControlCharts Members, Dew.Stats.Units Namespace, StatControlCharts Methods, Example, See Also

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