99% good

This topic has 2 replies, 3 voices, and was last updated 20 years, 6 months ago by gt.

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November 13, 2001 at 8:33 am #28214

Neynes Ladha
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what sixma level is 99% good?
what is 3.8 sigma as a percentage?
Can anybody help,
Kind Regards

NL

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November 13, 2001 at 12:47 pm #69927

Edwards
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99% good equates to 3.83 sigma level. This should answer both questions.

David

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November 13, 2001 at 6:56 pm #69945

gt
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99% good is 2.53 sigma long term, 3.83 short term
to help you:
use in excel:
norminv(.99,0,1)
wich is the std function we should use for normal distributed data. The .99 correspond to the yield, the other values come from the central limit theorem. To determine the z value or sigma of a certain process we have to use the z table wich comes from the normalization of the data to a normal distribution with a mean of zero and a std dev of 1
rgds

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