One Way Anova Test Statistic Formula. To view the summary of a statistical model in r use the summary function. So you find the mstr for the battery example here t is the number of battery types as follows.
Msw mean sum of squares within the groups. The overall f test is fairly robust to small deviations from these assumptions but you could use the kruskal wallis test as an alternative to one way anova if there was any doubt. Df factor r 1.
Indicates the number of independent elements in the sum of squares.
Total n t 1. Df factor r 1. Degrees of freedom df. The f statistic compares the variability between the groups to the variability within the groups.
