What Is 3.4 per Million?
What Is 3.4 per Million?
- Publication:
- Quality Progress
- Date:
- May 2004
- Issue:
- Volume 37 Issue 5
- Pages:
- pp. 63-65
- Author(s):
- Voelkel, Joseph G.
- Organization(s):
- John D. Hromi Center for Quality and Applied Statistics, Rochester Institute of Technology, Rochester, NY
Abstract
[Abstract from article]
When Motorola was connecting the notion of 6s to ppm levels, it assumed a process might shift 1.5s from its target. So Motorola based 3.4 ppm on such an assumption. In fact, such a shift should be considered very unlikely, as I will explain later. So, the 3.4 ppm is connected, in some way, with a putative 1.5s shift. The author analyses the situation.
Keywords
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