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

ANOVA Effect Size

Calculation Omega

Squared (ώ²) in Excel

Omega squared is calculated with the formula

(Click Image To See a Larger Version)

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

(Click Image To See a Larger Version)

An omega-squared value of 0.0732 would be classified as a medium size effect.

Magnitudes of omega squared are generally classified as follows: Up to 0.06 is considered a small effect, from 0.06 to 0.14 is considered a medium effect, and above 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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