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Capability Indices calculation for Nonnormal Distributions in Percentile Methods

Hi, I would like to figure out how JMP 16 Calculate Ppk in non-parametric method. So I calculate Ppk in R code with the formula in online documentations, but the results are very different. Could anyone help me to understand if it is my calculation error or the documentation?

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Re: Capability Indices calculation for Nonnormal Distributions in Percentile Methods

Sorry I post wrong JMP results, the JMP results are as follow:

Re: Capability Indices calculation for Nonnormal Distributions in Percentile Methods

Hi Luna

JMP基础统计的结果有吗？看看分位数的结果是否一致。如果公式本身没有问题的情况下。

Re: Capability Indices calculation for Nonnormal Distributions in Percentile Methods

Hello, I simply used R to calculate some percentiles, which are slightly different from JMP, but the Ppk calculation result is too different (R:2.026, JMP: 1.678), which may not be the error caused by the percentile calculation method .

Re: Capability Indices calculation for Nonnormal Distributions in Percentile Methods

For those having trouble following the conversation...

Are there any results for basic statistics? See if the results of the quantiles are consistent. If the formula itself is not a problem.

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