The F–test
The significance of the regression results can be tested by using the F- statistics. The F-statistics is a ratio which compares the explained sum of squares and the unexplained sum of squares.
Therefore, F = mean sum of squares due to regression
Mean sum of squares due to residual
For calculation purposes:
F = r2 /K
(1 – r2)/n-k-1
F statistics can then be used to test the hypothesis that the relationship between the dependent variables and all the independent variables is not significant.