==== 重复测量的方差分析的统计前提 ====
=== Statistical prerequisites for repeated measures ANOVA ===
  - 每个处理条件内的观察都是独立的；
    * Observations within each treatment condition are independent.
  - 每个处理条件内的总体分布是正态分布；
    * The overall distribution within each treatment condition is normal.
  - 每个处理条件间的方差同质。
    * Variance is homogeneous between each treatment condition.