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一、交互作用的概念如果试验目的不只是为了寻求较优配方(或工艺),而且还要比较准确地弄清楚各个因素对指标影响的大小,特别是各种因素不同水平相互搭配对指标的影响,就需要考虑因素之间的交互作用,这是混凝土材料试验研究工作中可能遇到的一类问题。用孤立变量法进行试验比较时,一般难于判断交互作用的大小,而正交设计能够考虑交互作用,并给出大小的估计,这正是它的主要优点之一。
First, the concept of interaction If the purpose of the experiment is not just to seek a better formula (or process), but also to accurately determine the impact of various factors on the size of the index, in particular, the impact of various factors in different levels of collocation on the index It is necessary to consider the interaction between factors, which is a type of problem that may be encountered in the experimental research of concrete materials. When using the isolated variable method to perform the test comparison, it is generally difficult to judge the size of the interaction, and the orthogonal design can consider the interaction and give an estimate of the size, which is one of its main advantages.