This function returns an approximation of P(X \in E1)/P(X \in E2), where
X is a central F random variable with
df1, df2 degrees of freedom.
TFRatioApprox(df1, df2, E1, E2)
degrees of freedom of the F random variable.
"Intervals" objects or matrices where rows represents a union of intervals with positive and finite endpoints.
This function returns the value of the approximation.
Bryc, Wlodzimierz. "A uniform approximation to the right normal tail integral." Applied mathematics and computation 127.2 (2002): 365-374.
Peizer, David B., and John W. Pratt. "A normal approximation for binomial, F, beta, and other common, related tail probabilities, I." Journal of the American Statistical Association 63.324 (1968): 1416-1456.
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