Calculating Cp and Cpk Values Cp-ProcessCapabilityRatios Comparesthewidthofthedatasetvariationtothespecificationwidth X LSL SpecificationWidth Cp USL Cp= USL-LSL6 ProcessWidth -3 T +3 Attributes AssumesprocessmeanonspecificationtargetCp=1.0industrystandard6SigmagoalCp=2.0 ©...
There seems to be many different methods of calculating CpCp/CpkCpk values in SPC, and I need help in determining which one to use at any given situation. Currently, we need to show CpCp/CpkCpk values when drawing two different chart. X-MR Chart X-Bar R Chart L...
Per my understanding, for each row in the table, you are first calculating Delta = USL - LSL and then updating 'sum' and 'sumsq'. Is it correct? If that's the case, then your mean and stdev calculations are incorrect and therefore you are getting incorrect Cp and Cpk values. And you...