
Gets the probability for the ratio of two variances from the selected Covariance object being different from a hypothesized ratio.
The test statistic
f = s_{1}^{2} / s_{2}^{2} / ratio 
is distributed as Fisher's F distribution with ndf_{1} = N1 and ndf_{2} = N1 degrees of freedom for the numerator and denominator terms, respectively.
The returned probability p will be the twosided probability
p = 2 * fisherQ (f, ndf_{1}, ndf_{2}) 
If s_{2}^{2} > s_{1}^{2} we use 1/f to determine the probability.
© djmw, April 7, 2004