正交试验设计方法.试验设计是数理统计学的一个重要的分支。多数数理统计方法主要用于分析已经得到的数据，而试验设计却是用于决定数据收集的方法。试验设计方法主要讨论如何合理地安排试验以及试验所得的数据如何分析等。-orthogonal design. Experimental Design mathematical statistics is an important branch. Most mathematical statistics methods have been used to analyze the data and experimental design was used to decide the method of data collection. Experimental design method to discuss how reasonable arrangements for tests and how the data analysis.