In a one-way ANOVA, the F-statistic is calculated as:
MSbetweenMSwithin\frac{MS_{between}}{MS_{within}}MSwithinMSbetween
MSwithinMSbetween\frac{MS_{within}}{MS_{between}}MSbetweenMSwithin
SSbetweenSSwithin\frac{SS_{between}}{SS_{within}}SSwithinSSbetween
SSbetween−SSwithinSS_{between} - SS_{within}SSbetween−SSwithin