PP （Performance Index of Process） 不考虑过程有无偏移，容差范围除以过程性能. Cpk （Preliminary process Capability） 考虑过程有偏差时，样本数据的过程性能。 * ppk 通常用来与cp及Cpk对比，度量和确认内改进的优先次序。 适用环境. ppk： 过程性能指数，表示的是过程在一段时间内的表现。 1 . 输出满足规格要求+预测图形+长期不稳定过程（不要求过程稳定）； 2 . 小批生产（试产）的过程性能评价，要求Ppk>1.67； 3 . 用于实时过程性能研究和初始过程能 …

What are Process Capability Indices? Cp, Pp, Cpk, and Ppk are capability and performance indicators for your process. Is a process capable? Is the process acceptable? How is the process actually behaving vs. how it theoretically could be behaving?

2021年12月6日 · Cp, Cpk, Pp 和 Ppk概念. Cp, Cpk, Pp 和 Ppk都是用来体现过程能力的指标，它们是用来测量过程能力的指数（process capability index），不是过程能力本身。很多人只知道计算这些指数，却并不知道过程的固有能力到底是什么。那什么是过程能力（process capability）？ 02 .

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2024年10月10日 · For many years industries have used Cp, Cpk, Pp, and Ppk as statistical measures of process quality capability. Some segments in manufacturing have specified minimal requirements for these parameters, even for some of their key documents, such as advanced product quality planning and ISO/TS-16949.

Cpk and Cp are calculated from control chart data, and Ppk and Pp are calculated from batch data without regard to subgroup size. From where does the idea that Cpk is a measure of short-term capability and Ppk a measure of long-term capability come?

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