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Acceptance Limits for Control Charts

Please make Acceptance Limits available in JMP Control Charts.

Introduced by Friend in 1957, the illustration below provides the formula and a chart that uses Acceptance Limits in conjunction with standard Shewhart Control Limits, published in Zhang (Editor), 2016: Nonclinical Statistics for Pharmaceutical and Biotechnology Industries, Chapter 21, Altan et al.: Process Capability and Statistical Process Control, p. 566.

 

Acceptance Limits are used to make sure that a process characteristic keeps a safe distance from specification limits, based on the assumption of a normal distribution. The process mean is irrelevant for the calculation of these limits. For high-cpk process characteristics, Shewhart Limits and Acceptance Limits can be very different. If they could be used in conjunction in JMP as suggested in the illustration, that would be great.

 

AcceptanceChart_and_Limits.jpg

 

 

 

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