assumption diagram

Under the assumption that observing variables are normal distribution, the methods introduced to draw the Q-Q 、 principle component quality oval diagram and T 2 quality control chart are discussed.

阐明了主成分分析法的原理，在观测变量为正态分布的假设下，论述了QQ图、主成分质量椭圆图以及T2控制图的原理及构造方法。

At present, the machine layout problem of semiconductor assembly and test workshop is usually solved by entity model or layout assumption diagram with a little quantitative calculation which lack of scientific quantitative calculation, theory guiding and flexibility for the change of manufacturing.

目前，其车间设备布局问题通常通过建立实体模型或绘制大量布局方案图并辅以少量的定量计算来解决，这种方式缺少科学的定量分析和理论指导，并且对于车间生产变化的应对能力相对不足。