This is one of the following sixteen articles on Single-Factor ANOVA in Excel

ANOVA Effect Size

Calculation Eta Squared

(η²) in Excel

Eta squared is calculated with the formula

η² = SS_{Between_Groups} / SS_Total

and is implemented in Excel on the data set as follows:

(Click Image To See a Larger Version)

An eta-squared value of 0.104 would be classified as a medium-size effect.

Magnitudes of eta-squared are generally classified exactly as magnitudes of r² (the coefficient of determination) are as follows: = 0.01 is considered a small effect. = 0.06 is considered a medium effect. = 0.14 is considered a large effect. Small, medium, and large are relative terms. A large effect is easily discernible but a small effect is not.

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