Chapter 5: Capability Analysis, using Metrics like Cpk and Pp
Abstract : Capability analysis, using metrics like Cpk and Pp, is a statistical method to assess a process's ability to consistently produce outputs within specified limits, essentially measuring how well a process can meet customer requirements by evaluating its variation relative to the tolerance range; Cpk focuses on both process variation and centering, while Pp only considers the variation itself, making Cpk a more comprehensive measure when assessing a process's capability to produce within specifications. Key points about Cpk and Pp: Cpk (Process Capability Index): Measures how well a process is centered within the specification limits, considering both the variation and the mean position relative to the upper and lower specification limits. A higher Cpk value indicates a more capable process, with a generally accepted "good" Cpk value being above 1.33. Pp (Process Performance Index): Measures the potential capability of a process by only conside...