Statistics Reference for Quality AnalytiX

Quality AnalytiX offers many different types of statistics that you can view in control charts and reports. This topic presents the different variables and formulas used to calculate these statistics within the following tables:

Variables in Control Charts

Factors for Constructing Variables in Control Charts

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Variable Definitions

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Values for XBarR Control Charts

The following values apply to configurations in which you select the "XBarR" Collection Type in the SPC Tag Configuration Dialog.

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Values for XBarS Control Charts

The following values apply to configurations in which you select the "XBarS" Collection Type in the SPC Tag Configuration Dialog.

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Variables for XMR Control Charts

The following values apply to configurations in which you select the "XMR" Collection Type in the SPC Tag Configuration Dialog.

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Variables for MedianR Control Charts

The following values apply to configurations in which you select the "MedianR" Collection Type in the SPC Tag Configuration Dialog.

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Capability Analysis

Definitions

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Formulas

For configuration where you have enabled the check box next to Data is Normal in the Statistics tab of the SPC Tag Configuration Dialog, use the values in the left column of the following table. If you have not enabled this check box (and your plant data may not follow a normal distribution), use the values in the right column instead.

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See also:

Summary Statistics