简单主效应 Simple Main Effect

在得出交互作用显著的结论之后，考察因素A的某个水平上因素B的不同水平均值的差异，我们把检验得到的显著结果称为因素B在因素A该水平上的主效应。
- After concluding that the interaction is significant, the difference between the different water means of factor B at a given level of factor A is examined, and we refer to the significant result obtained from the test as the main effect of factor B at that level of factor A.

处理内的变异以及自由度将仍采用包含二因素方差分析中所有处理方式的结果，而不是根据所选取的处理组进行重新计算。
- Within-treatment variation as well as degrees of freedom will still be used to include the results of all treatments in the two-way ANOVA, rather than being recalculated based on the selected treatment group.
计算效应量:，其中B指处理间(Between)，W指处理内(Within)。