ANOVA Effect Sizes — η² & ω²

Enter F and either df1, df2 or N, k. Results update live.

F-ratio

df1 (effect)

df2 (error)

N (total observations)

k (groups)

If you enter N and k, we set df1 = k − 1 and df2 = N − k. This will only work for Fisher's ANOVA; Welch's requires an adjustment of df2 (error df).

η² (eta squared)

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ω² (omega squared)

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Formulas

eta_squared = (F * df1) / ((F * df1) + df2)

omega_squared = ((F - 1) * df1) / ((F * df1) + df2 + 1)