Normal Data for Control Charting?

This topic has 2 replies, 3 voices, and was last updated 19 years ago by rams.

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July 26, 2003 at 7:06 pm #32892

Pritesh
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Hi!!
I need some help….does data have to be normal to be able to be control charted and have control limits established?
This is a question posed to me durring an internal audit of our processes.

Thanks for your help.
-Pritesh.

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July 27, 2003 at 2:26 am #88384

Gabriel
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NO.
Absolutely not.
In fact, non-normal distributions are charted all the time. For example, R (in an Xbar-R chart) is not normal by definition of Range.

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July 28, 2003 at 6:31 am #88390

rams
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Also, that is why we use Xbar charts to achieve normality of data by invoking the central limit theorem.

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