Power and Sample Size Calculation

The corrected sum of squares (CSS) is calculated as the sum of the squared distance from each treatment mean to the grand-mean. For example, there are two treatments with mean of 10 and 20, respectively. That gives us a grand mean of (10+20)/2=15 (assuming equal cell size). Therefore, the corrected sum of squares is: (10-15)2+(20-15)2=50. ................
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