#Variance explained = between-group variance / within-group variance (Note that this is the ANOVA F-statistic).
Using the [[https://en.wikipedia.org/wiki/Law_of_total_variance Law of total variance]], total variance = between-group variance + within-group variance. '''From Wikipedia:'''
:https://en.wikipedia.org/wiki/F-test The F-test] in one-way analysis of variance is used to assess whether the expected values of a quantitative variable within several pre-defined groups differ from each other.