The most common application of the F distribution is in standard tests of hypotheses in analysis of variance and regression.

The plot shows that the F distribution exists on the positive real numbers and is skewed to the right.
x = 0:0.01:10;
y = fpdf(x,5,3);
plot(x,y)

Y = fpdf(X,V1,V2) computes the F pdf at each of the values in X using the corresponding numerator degrees of freedom V1 and denominator degrees of freedom V2. X, V1, and V2 can be vectors, matrices, or multidimensional arrays that all have the same size. A scalar input is expanded to a constant array with the same dimensions as the other inputs. V1 and V2 parameters must contain real positive values, and the values in X must lie on the interval [0 ∞).

MATLAB命令在建模中的使用 [b,bint,r,rint,stats]=regress(y,x,0.05) 第二是F统计量，第三个是与F统计量对应的概率值p。 例如得到模型的回归b