Calculated Decision

Abstract:Control charts and capability analyses created to provide proof of process control and process capability assume data follow a normal distribution, but this is not the case and standard calculations can therefore be incorrect. This problem can be solved by transforming data to follow the normal transformation or by using an appropriate non-normal distribution model. Calculations illustrated by an example can be used to verify process control and calculate process capability for non-normal quality …

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--Todd Stewart, 01-23-2009

Excellent article and very useful, especially in service or transactional processes where the normal distribution is usually not the right one when you're trying to improve process cycle time.
--Jose, 01-16-2009

Good and well-founded article. I have used the same approach before, and I am glad that a simple solution is provided.
--Rodrigo Rojo, 01-14-2009

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