在非正态条件下确定控制界的若干方法

The Methods of Determining Control Limits Under Non-normality

体哈特控制图的基本假定是欲控质量特性的统计量服从正态分布.然而这一假定并不总是成立的.本文讨论在非正态条件下确定控制界的3种可行方法,并对它们的优缺点和应用条件作了评述.

The fundamental assumption for Shewhart Control Charts is that the statistics desired to control the quality depend on normal distribution.This requirement may not be fulfilled in certain cases,however.Three methods of determining the control limits under the non-normality,viz,conventional shewhart method,accurate method and split-distri- bution method,are discussed in this paper.Also some comments to the methods listed above are given by the author.