Monthly Archives: January 2010

Capability Analysis ( Cp, Cpk, Pp, Ppk ) Part 4 – How to perform Normal Capability Analysis ?

In fact, most people will come to this step to do Normal Capability Analysis without checking the statistical assumptions ( stability and Normality ) Most will use Microsoft Excel worksheet to calculate Cp & Cpk but seldom will calculate Pp … Continue reading

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Capability Analysis ( Cp, Pp, Cpk and Ppk ) Part 3 – Is the sample data Normally distributed ?

There are many methods to test whether a sample data is Normally distributed or not. In Minitab statistical software, there are basically 3 Normality test methods namely Anderson-Darling, Ryan-Joiner and Kolmogorov-Smirnov. There are pros and cons of using the relevant … Continue reading

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Capability Analysis ( Cp, Pp, Cpk and Ppk ) Part 2 – Is the process stable ?

Reference capability analysis road map shown in previous blog, one need to ensure the process is stable and the data is Normally distributed prior to conducting Normal capability analysis ( calculation of Cp, Cpk, Pp and Ppk ). Note : … Continue reading

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Capability Analysis ( Cp, Pp, Cpk and Ppk ) Part 1

Most Six Sigma / Improvement practitioners will not feel strange to the use and application of capability analysis. A lot of capability analysis studies have been done to evaluate how capable of a process / product quality. Typically on Measure … Continue reading

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Questions on Measurement System Analysis ( MSA ) Part 3

Q8 : How do you interpret % Cont, % Study Var and % Tolerance  and what’re the implications? R8 : %Cont and %Study Var are equivalent and both are different from %Tolerance  if from the point view of interpretation and … Continue reading

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