计量型数据MSA.pptVIP

计量性数据MSA 简单测量分析－ 续 Simple Measurement Study - continued 使用描述性统计， 计算Delta 的标准差 Using Descriptive Statistics, calculate the standard deviation of Delta 这个标准差被称为测量标准误差 This standard deviation is called the Standard Error for Measurement 其主要代表了什么，重复性还是再现性？ Which does this primarily represent, Repeatability or Reproducibility? 简单测量分析－ 续 Simple Measurement Study - continued 使用上面的标准差，什么是测量分布的良好估计值 Using the standard deviation above, what would be a good estimate of measurement spread? 简单测量分析－ 续 Simple Measurement Study - continued 测量能力指数- P/T Measurement Capability Index - P/T 精确性和公差比率 Precision to Tolerance Ratio 描述有多少百分比的公差是被测量系统误差占用了 Addresses what percent of the tolerance is taken up by measurement error 同时包含了重复性和再现性 Includes both repeatability and reproducibility 操作者 x 单位x 试验次数 Operator x Unit x Trial experiment 最佳情况 Best case: 10% ； 可以接受 Acceptable: 30% 精确度和公差比率Precision to Tolerance Ratio 测量能力指数－ % GRR Measurement Capability Index - % GRR 描述有多少总变差比率是由测量系统误差造成的 Addresses what percent of the total variation is taken up by measurement error 同时包含了重复性和再现性 Includes both repeatability and reproducibility 操作者 x 单位x 试验次数 Operator x Unit x Trial experiment 作为一个目标，我们期望%RR 30% As a target, look for %RR 30% ％重复性和再现性% Repeatability Reproducibility 测量误差对能力指数的影响Measurement Error Effect on Capability Indices 测量误差越高，对你了解真正流程产能的影响越剧烈！ The higher the measurement error the more dramatic the impact on your ability to understand the true process capability! P/T (% Tolerance) 的应用Uses of P/T (% Tolerance) P/T比率（ Minitab中的％公差）是对测量系统精确度的最常用的估计 The P/T ratio (% Tolerance in Minitab) is the most common estimate of Measurement System precision 这个估计可以用于估计测量系统对于规格的性能表现如何 This estimate may be appropriate for evaluating how well the Measurement System can perform with respect to specifications 然而规格有可能会太苛刻或太宽松 Specifications, however, may be too tight or too loose 通常来说，当测量系统纯粹用于产品样本分类时， P/T率会是一个良好的估计工具 Generally, the P/T ratio is a good