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Risk-Calibrated Process Capability Approval with Finite Samples

Fei Jiang, Lei Yang

Process capability approval decisions can be risk-calibrated to account for finite-sample estimation uncertainty and asymmetric operational losses.

arxiv:2603.14479 v2 · 2026-03-15 · stat.AP · stat.ME

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Claims

C1strongest claim

The resulting formulation unifies several commonly used procedures, including deterministic thresholding, lower confidence bound rules, and probability-based approval rules, and naturally extends them to cost-sensitive decision rules derived from asymmetric operational loss.

C2weakest assumption

The standard error of the C_pk estimator can be reliably computed from finite samples and that the underlying process distribution permits standard capability index estimation (typically normality).

C3one line summary

Risk-calibrated process capability approval uses a threshold of C0 plus k times the standard error of the C_pk estimate, with k chosen from tolerable failure probability or false-accept/false-reject cost ratio.

References

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[1] McGraw-hill New York, 1979 1979
[2] John wiley & sons, 2020 2020
[3] Statisticalmethodsinprocessmanagement – capability and performance – part 1: General prin- ciples and concepts 2014
[4] Statisticalmethodsinprocessmanagement – capability and performance – part 4: Process capa- bility estimates and performance measures 2016
[5] Victor E. Kane. Process Capability Indices.Jour- nal of Quality Technology, 18(1):41–52, January 14

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1c8cf16d6507e6e07f244fa2b720c07b32939d6b1d2b83e2e266f539223682f4

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arxiv: 2603.14479 · arxiv_version: 2603.14479v2 · doi: 10.48550/arxiv.2603.14479 · pith_short_12: DSGPC3LFA7TO · pith_short_16: DSGPC3LFA7TOA7ZE · pith_short_8: DSGPC3LF
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curl -sH 'Accept: application/ld+json' https://pith.science/pith/DSGPC3LFA7TOA7ZEJ6RLOIGAPM \
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Canonical record JSON
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