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May 23, 2017 5:21 AM
(916 views)

1 ACCEPTED SOLUTION

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May 23, 2017 1:00 PM
(1764 views)

Solution

Correct? That's a different question. The 'correctness' of an approach is dependent on many aspects to the process capability analysis problem. For example: 1. Does your process data exhibit any evidence of assignable cause variation? 2. Does your data appear to be normally distributed? The answer to these questions influences the approach that is optimal for calculating process capability indices over and above the sheer mathematics associated with the reference in my first reply.

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May 23, 2017 12:56 PM
(893 views)

Here's a reference for you in the JMP Online Documentation.

http://www.jmp.com/support/help/13/Capability_Analysis_2.shtml#1161749

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May 23, 2017 1:00 PM
(1765 views)

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May 24, 2017 2:59 AM
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Thank You

Data are normal distributed with no assignable cause variation. I assume the answer I was looking for (found in Process Capability in JMP 2012) is that if I do not group data JMP will automatically use moving range subgroup size 2 to calculate cpk.

KR

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