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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 Natural process variation ： ウィキペディア英語版 Natural process variation Natural process variation, sometimes just called process variation, is the statistical description of natural fluctuations in process outputs. == Equations == The following equations are used for an ''x''-bar-control chart: :$\backslash bar\; x\; =\; \backslash sum\_^n\; x\_i/n$ :$\backslash sigma\_\; =\; \backslash sigma/\backslash sqrt\; n$ In the example, with ''n'' = 10 samples, the targeted mean, $\backslash bar\; x$, and standard error of the mean, $\backslash sigma\_$ are: :$\backslash bar\; x\; =\; 1$ :$\backslash sigma\_\; =\; 0.1/\backslash sqrt\; 10\; =\; 0.0316$ That is, independent 10-sample means should themselves have a standard deviation of 0.0316. It is natural that the means vary this much, for by the central limit theorem the means should have a normal distribution, regardless of the distribution of the samples themselves. The importance of knowing the natural process variation becomes clear when we apply statistical process control. In a stable process, the mean is on target; in the example, the target is the filling, set to 1 litre. The variation within the upper and lower control limits (UCL and LCL) is considered the natural variation of the process. 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「Natural process variation」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.