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Quality Specifications and Process Capability Analysis with R

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Quality Control with R

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Abstract

In order to assess quality, specification limits are to be established. In this chapter a method to set specification limits taking into account customers’ and producer’s loss is presented. Furthermore, the specification limits are the voice of the customer, and quality can be assessed by comparing it with the voice of the process, that is, its natural limits. Capability indices and the study of long- and short-term variability do the job.

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Notes

  1. 1.

    A current trend is to use voice of stakeholders (VoS) instead of VoC.

  2. 2.

    see Chapter 4 for details on ISO standards development stages.

  3. 3.

    Production is applicable to products and services for the scope of this chapter.

  4. 4.

    This way of fixing specifications is called functional tolerance in Taguchi’s method terminology.

References

  1. Cano, E.L., Moguerza, J.M., Redchuk, A.: Six Sigma with R. Statistical Engineering for Process Improvement, Use R!, vol. 36. Springer, New York (2012). url http://www.springer.com/statistics/book/978-1-4614-3651-5

  2. ISO TC69/SC1–Terminology and Symbols: ISO 3534-1:2006 - Statistics – Vocabulary and symbols – Part 1: General statistical terms and terms used in probability. Published standard (2010). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=40145

  3. ISO TC69/SC1–Terminology and Symbols: ISO 3534-2:2006 - Statistics – Vocabulary and symbols – Part 2: Applied statistics. Published standard (2014). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=40147

  4. ISO TC69/SC4–Applications of statistical methods in process management: ISO 22514-3:2008 - Statistical methods in process management – Capability and performance – Part 3: Machine performance studies for measured data on discrete parts. Published standard (2011). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=46531

  5. ISO TC69/SC4–Applications of statistical methods in process management: ISO 22514-7:2012 - Statistical methods in process management – Capability and performance – Part 7: Capability of measurement processes. Published standard (2012). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=54077

  6. ISO TC69/SC4–Applications of statistical methods in process management: ISO 22514-2:2013 - Statistical methods in process management – Capability and performance – Part 2: Process capability and performance of time-dependent process models. Published standard (2013). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=46530

  7. ISO TC69/SC4–Applications of statistical methods in process management: ISO 22514-6:2013 - Statistical methods in process management – Capability and performance – Part 6: Process capability statistics for characteristics following a multivariate normal distribution. Published standard (2013). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=52962

  8. ISO TC69/SC4–Applications of statistical methods in process management: ISO/TR 22514-4:2007 - Statistical methods in process management – Capability and performance – Part 4: Process capability estimates and performance measures. Published standard (2013). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=46532

  9. ISO TC69/SC4–Applications of statistical methods in process management: ISO 22514-1:2014 - Statistical methods in process management – Capability and performance – Part 1: General principles and concepts. Published standard (2014). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=64135

  10. ISO TC69/SC4–Applications of statistical methods in process management: ISO 22514-8:2014 - Statistical methods in process management – Capability and performance – Part 8: Machine performance of a multi-state production process. Published standard (2014). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=61630

  11. ISO TC69/SC8–Application of statistical and related methodology for new technology and product development: ISO 16336:2014 - Applications of statistical and related methods to new technology and product development process – Robust parameter design (RPD). Published standard (2014). url http://www.iso.org/iso/catalogue_detail.htm?csnumber=56183

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Cano, E.L., Moguerza, J.M., Corcoba, M.P. (2015). Quality Specifications and Process Capability Analysis with R. In: Quality Control with R. Use R!. Springer, Cham. https://doi.org/10.1007/978-3-319-24046-6_8

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