Six Sigma and Beyond-The 1.5 Sigma Shift

Topics:
Six Sigma
Tags:
Business Operations,
It Operations,
Process Improvement,
QCI International,
Quality,
Six Sigma,
Tqm/Six Sigma/ISO 9000
Source:
QCI International

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Overview: "Few Six Sigma concepts create more confusion (or wrath) than the so-called 1.5 sigma shift. Over the years, the majority of those writing about the subject really don't understand it. In this column,effforts has been made to explain the true rationale behind this infamous ""statistical correction."" The Standard Normal Distribution Curve.The standard normal distribution provides the starting point for discussion. This distribution has been extensively studied and tabularized, and many natural systems can be approximated with it. Six Sigma modifies this procedure by ""adjusting"" the calculated mean by 1.5 sigma before estimating the percentage out of specification. This article basically depicts mathematical calculation of 1.5sigma with the help of various tools and statistical method. "

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