what is an f value in stats
And since the sample size n2 = 13, the degrees of freedom v2 = n2 - 1 = 12. The f statistic is equal to 2.51. Now, we are ready to use the F Distribution Calculator. We enter the degrees of freedom (v1 = 24), the degrees of freedom (v2 = 12), and the f value (2.51) into the calculator; and hit the Calculate button. The calculator reports that the cumulative probability is 0.95.