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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 Variables sampling plan ： ウィキペディア英語版 Variables sampling plan A variables sampling plan is an acceptance sampling technique. Plans for variables are intended for quality characteristics that are measured in a continuous scale. This plan requires the knowledge of the statistical model e.g. normal distribution. The historical evolution of this technique dates back to the seminal work of Wallis (1943). The purpose of a plan for variables is to assess whether the process is operating far enough from the specification limit. Plans for variables may produce a similar OC curve to attribute plans with significantly less sample size. The decision criterion of these plans are :$\backslash bar+\; k\backslash sigma\; \backslash leqslant\; USL$ or $\backslash bar-\; k\backslash sigma\; \backslash geqslant\; LSL$ where $\backslash bar$ and $\backslash sigma$ are the sample mean and the standard deviation respectively, $k$ is the critical distance, $USL$ and $LSL$ are the upper and lower regulatory limits. When the above expression is satisfied the proportion nonconforming is lower that expected and therefore the lot is accepted. A variables sampling plan can be designed so that the OC curve passes through two points (AQL,$\backslash alpha$) and (LQL,$\backslash beta$). AQL and LQL are the Acceptable quality limit and the limiting quality level respectively. $\backslash alpha$ and $\backslash beta$ are the producer and consumer’s risks. The required sample size ($n$) and the critical distance ($k$) can be obtained as :$k\; =\; \backslash frac+Z\_Z\_\}\}$ where $Z$ is the normal distribution function. When the dispersion is known the required sample size ($n$) is obtained from :$n\; =\; \backslash left\; (\; \backslash frac\}\backslash right\; )^$ while for unknown $\backslash sigma$ the sample size is approximately :$n\; =\; \backslash left\; (\; \backslash frac\}\backslash right\; )^\backslash left\; (\; 1+\backslash frac\; \backslash right\; )$ The MIL-STD-414 provides tables to obtain the required sample size and the critical distance according to the type of inspection. == See also == * Acceptance sampling 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「Variables sampling plan」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.