Acceptance Range of CV (Coefficient of Variance)

This topic has 3 replies, 4 voices, and was last updated 12 years, 8 months ago by GUSA.

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October 26, 2009 at 11:07 am #52833

bugtas
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Can someone tell me how to set the acceptance range of CV?
How many % is considered acceptable for a process?

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October 26, 2009 at 12:49 pm #186368

Ken Feldman
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Haven’t seen a published standard but I like my s.d. to be about 1/10 of the mean but no real reason other than it feels good.

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October 26, 2009 at 12:50 pm #186369

newbie
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It is not a measure that falls into a “pass/fail” classification, but is useful due to its relativity to both the process mean, and when used as a comparison measure. Although I have never found any hard information on this, I have heard a rule of thumb that has worked well for me: A COV above 10% will point toward potential issues with process variability. Again, ROT.

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October 26, 2009 at 1:02 pm #186370

GUSA
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Never heard of any such measure , unless you are referring to ‘coefficient of variation’!No laid down acceptance criteria for ‘CV’ . YOu can only use it to compare two processesGUSA

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