Omega squared
Omega squared (W2) or eta squared (R2), are the indicies (predetermined scales) that are used to measure the effect size of an ANOVA.
The formula to find the ANOVA`s omega squared value:
In statistics effect size is a measure of the strength of the relationship between two variables. In scientific experiments, it is often useful to know not only whether an experiment has a statistically significant effect, but also the size of any observed effects. In practical situations, effect sizes are helpful for making decisions.
Effect size is measured with either eta squared (R2) or omega squared (W2).
*Note: "Effect size means how big is your difference." - Statmaster C.
**Note: Effect size is related to power.
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