Encyclopedia And Handbook of Process Capability Indices: A by W L Pearn;Samuel Kotz;Wen-Lea Pearn

By W L Pearn;Samuel Kotz;Wen-Lea Pearn

This certain quantity offers an updated and unique description of many of the procedure power indices greatly (and occasionally misleadingly) utilized in the functions at creation websites. The authors, who're across the world well-known specialists during this sector with quite a few contributions to the sphere, offer a lucid exposition, which covers the entire major facets, advancements and advances. the concept that of method potential Index (PCI) is just twenty years outdated, however the multitude of accessible models can crush even the main pro practitioner. The equipped and self-contained presentation of the fabric ranging from 1980's primitive indices (Cp and Cpk) as much as the newly proposed indices for the situations of a number of established features ends up in an authoritative and fundamental reference. a formal stability among theoretical research and "rule-of-thumb" useful methods is maintained to be able to do away with the tensions between numerous methodologies of assessing the aptitude of business procedures.

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Additional resources for Encyclopedia And Handbook of Process Capability Indices: A Comprehensive Exposition of Quality Control Measures (Series on Quality, Reliability and Engineering Statistics)

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1. E. 850 testing for Cp based on (X, R) samples When estimating the process capability precision by means of the range method from the (X, R) control chart samples, the critical value C0^ can be obtained by finding an appropriate value satisfying the following equation: P(Cm > Cm ' _d_ ~ P \Cp=C) = a > C ,0(R) = P *hn,n .. Ofl d CQ{R) 3(7 xl<^c cC,0(R) Note that d = (USL — LSL)/2 is unrelated to d^ and dP . ,a i s the lower a -th percentile of the chi-square distribution with v degree of freedom.

2 Hypotheses testing for Cp based on (X, S) samples If a ( X , S) control chart is available, then the critical value Co(s) can be obtained by determining the appropriate value satisfying the equation P(CP{S) > CQ{S) \Cp = C) = a 1 _ p —i==-x Cp exp (Cp/x-lf 2k2 dx In fact, the critical value C^s) c a n D e found and expressed as follows, with za representing the lower 100a % percentage point of the standard normal distribution, N( 0,1): 28 Encyclopedia and Handbook of Process Capability Indices c Co(5) = msn_i where e — n-l — r>/2] n-lT[(n-l)/2] Under the same conditions, the p-value corresponding to S(5) ' a s P ec ifi° value calculated from the sample data, can be expressed as: p-value = P(Cp(s) = 1- > cp{s) | Cp = C) r cp(s) C„ _„z / ,-- x exp F J 0 V27Tfc {Cp/x-lf 2k2 dx where k and e„_!

Furthermore, the r-th moment of Ca can directly be obtained as: E{CTa) VF1 = E r /r =E (-lyzj-'^r'/ 2 ). j=0 Now, following Pearn ei a/. (1998) we arrive at: £(C0) = C 0 >/2e"A/2 - ±£>VTT ^ — + 2(l-Ca)$(-|«l).. 1 9 / 9 ^ A/ 2 2V2e~ E(C2a ) = C l + ^ - ~ ~ ^ - + 4 ( 1 - Ca and where $(•) is as above distribution N(0,1). f. = )$(-\6\), of the s t a n d a r d E(Cl)-E2{Ca). -i-i^-i- d / < r ' where £ = (/j, — M) / a . In the case when Ca = C , b = d /a can be expressed as b =| £ | /(l — C ) . )^t + ^ ^ + ^ _^ ^ = l- 7 .

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