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  Statistical Techniques and 6 Sigma
  Unilateral tolerance capability assessments

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Author Topic:   Unilateral tolerance capability assessments
KH Smith
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posted 02 May 2000 04:45 PM           Edit/Delete Message   Reply w/Quote
Have you ever heard of using log normal calculations to calculate Cpm ratio. Ir gives a differnet result that using traditional methods. Why use log norma?

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Marc Smith
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posted 09 May 2000 07:22 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Sorry I can't help here. Theory isn't my strong suite.

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Jim Biz
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posted 09 May 2000 08:30 AM     Click Here to See the Profile for Jim Biz   Click Here to Email Jim Biz     Edit/Delete Message   Reply w/Quote
Truly not my strong suit either - but from what I understand:

Why use it? ..it's quick - few calculations -just "Count/Graph then compare to what can be considered a "Normal population curve"... result is a "Probable estimation of % outside or inside spec.. in the "whole" population of all similar products produced --- Call it a simple - brief- snapshot of a population/at that given time period... If you choose another set of samples the result may be quite different from day to day... or from sample set to sample set.

Their use is fairly easily exlained to the end user..

Regards
Jim

[This message has been edited by Jim Biz (edited 10 May 2000).]

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