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Hello again,
Thanks you all for your support i have now lot of links and information to dig in. Bev D, i started to check your excel files you sent to me and i have 2 questions regarding one of them.
Regarding "Excel document: "Confidence Intervals Cpk Process Capability.xls",
- Can you please define "Error". Is it acceptable defect rate , 'accepted' 10 % of the time - or rejected 90% of the time.
-Can you also explain the difference between "CPK not less than" and "CPK min"?
- You wrote "for example if you want a Cpk of 1.67, and a 95% confidence (alpha) with an acceptable error rate of .1 then your sample size is 408." But if i choose a larger sample size than 408? For example 462, do i have 96% confidence (alpha)?
-
My colleague and i discussed if you also have an excel file for conversion of Cpk to PPM?
Thanks you all for your support i have now lot of links and information to dig in. Bev D, i started to check your excel files you sent to me and i have 2 questions regarding one of them.
Regarding "Excel document: "Confidence Intervals Cpk Process Capability.xls",
- Can you please define "Error". Is it acceptable defect rate , 'accepted' 10 % of the time - or rejected 90% of the time.
-Can you also explain the difference between "CPK not less than" and "CPK min"?
- You wrote "for example if you want a Cpk of 1.67, and a 95% confidence (alpha) with an acceptable error rate of .1 then your sample size is 408." But if i choose a larger sample size than 408? For example 462, do i have 96% confidence (alpha)?
-
My colleague and i discussed if you also have an excel file for conversion of Cpk to PPM?
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