是1986年由摩托罗拉公司的比尔·史密斯提出的概念；此概念属于制造业的品质管理范畴，西格玛（Σ，σ）指统计学中的标准差。旨在生产过程中降低产品及流程的缺陷次数，防止产品变异，提升品质。六标准差也可作为企业策略的制定工具，在其他范畴内，任何导致顾客不满的东西都被定义为瑕疵。
随着企业对质量要求的不断提升,西格玛不仅仅是个数学术语,还演变成了衡量过程能力的关键指标。西格玛水平(Sigma Level)用来描述过程满足质量要求的能力。比如,一家企业如果能够保持3西格玛的水平,其产品合格率高达99.73%。这听起来不错,但要让过程的合格率进一步上升至五西格玛或六西格玛,所需付出的努力与投入却是一个...
sigma_vs_dpmo-西格玛水平与不合格率之间的转换 SigmaLevelVSDPMO西格玛水平换算表 EnterSigmaLevel输入西格玛水平 ZValueZ值 P合格率 P%百分合格率 DPMO不合格百万分率 3.4001.9000.971283440297.12834402%28716.5598160019
1 Sigma is the absolute lowest level, with 31% of the yield being free of defects. 6 Sigma is the highest, with over 99% of the yield being free of defects. Organizations should strive for 6 Sigma, but can readily attain 5 Sigma. Organizations with a 4 Sigma or lower have some...
Sigma (标准方差) Sigma Level (西格玛水平) Six Sigma (六个西格玛) ... blog.tianya.cn|基于8个网页 2. 西格玛级别 ...s by yearB US$西格玛 (Sigma)西格玛级别(Sigma Level)西格玛水平与改进后的完好度水平有关。www.doc88.com|基于7个网页 3. 西格玛水准 1 表格上的西格玛水准(Sigma level) 1......
Remember that value is determined by the customer. Some processes can afford to have a lower sigma level, as the level of quality required by the customer is not the highest. The customer may not always be willing to pay for a process with the highest quality standards. Other processes, su...
先分别算出DPO 和 DPMO之后用 DPMO到 Z-table里面找相应的长期和短期sigma level
PPM_Cp_Cpk_sigma Level Cp、Cpk、PPM、西格玛水平对比表 潜在过程能力Cp 偏离度k 假定均值与公差中心偏移1.5σ 实际过程能力Cpk PPM值 考虑了1.5σ的偏移 西格玛水平潜在能力评价 措施 CpT6 0.20.330.40.60.670.80.9 11.11.21.31.331.41.51.61.67 2 k2MT 12Cp 2.501.521.250.830.750.630....
Since, especially in industry, many quality problems are related to excessive variation, the concept σ has become a basis for the definition of a measure for conformance quality: the sigma metric or sigma level . The sigma level indicates the performance of a process, namely: what percentage ...
Lean Six Sigma is a team-focused managerial approach that seeks to improve performance by eliminating waste and defects.