PsychStatsWiki

• SS总和 = SS组间 + SS组内 = SS组间 + SS被试间 + SS误差
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• 注：重复测量方差分析中，由于不考虑被试间的变异性（即个体差异），所以SS组内只需考虑SS误差

和方的计算公式

自由度

• 共有5个自由度, 2个计算均方时要用到

1. 总的 df = N-1
2. 组间方差df = k-1
3. 组内方差df = N-k
4. 被试间方差df = n-1
5. 误差方差df = （N-k） -（n-1）= N-k-n+1

• Total SS=Between SS Groups + Within SS Groups=Between SS Groups + Between SS Subjects + SS Error
• 
• Note: In repeated measures ANOVA, since variability between subjects (i.e. individual differences) is not considered, only SS error needs to be considered within the SS group