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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Process performance index ： ウィキペディア英語版 Process performance index In process improvement efforts, the process performance index is an estimate of the process capability of a process during its initial set-up, ''before'' it has been brought into a state of statistical control. Formally, if the upper and lower specifications of the process are USL and LSL, the estimated mean of the process is $\backslash hat$, and the estimated variability of the process (expressed as a standard deviation) is $\backslash hat$, then the process performance index is defined as: :$\backslash hat\_\; =\; \backslash min\; \backslash Bigg(\},\; \}\; \backslash Bigg)$ $\backslash hat$ is estimated using the sample standard deviation. Ppk may be negative if the process mean falls outside the specification limits (because the process is producing a large proportion of defective output). Some specifications may only be one sided (for example, strength). For specifications that only have a lower limit, $\backslash hat\_\; =\; \}$; for those that only have an upper limit, $\backslash hat\_\; =\; \}$. Practitioners may also encounter $\backslash hat\_\; =\; \backslash frac\; \{6\; \backslash times\; \backslash hat\{\backslash sigma\}\}$, a metric that does not account for process performance that is not exactly centered between the specification limits, and therefore is interpreted as what the process would be capable of achieving if it could be centered and stabilized. ==Interpretation== Larger values of Ppk may be interpreted to indicate that a process is more capable of producing output within the specification limits, though this interpretation is controversial. Strictly speaking, from a statistical standpoint, Ppk is meaningless if the process under study is not in control because one cannot reliably estimate the process underlying probability distribution, let alone parameters like $\backslash hat$ and $\backslash hat$.〔Citation | last = Montgomery | first = Douglas | title = Introduction to Statistical Quality Control | publisher = year = 2005 B> is a convenient metric to gauge how set-up is progressing (increasing Ppk being interpreted as "the process capability is improving"). The risk is that Ppk is taken to mean a process is ready for production before all the kinks have been worked out of it. Once a process is put into a state of statistical control, process capability is described using process capability indices, which are formulaically identical to Ppk (and Pp). The indices are named differently in order to call attention to whether the process under study is believed to be in control or not. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Process performance index」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.