Snedecor's F law
Snedecor's F law (Casella–Berger, Definition 5.3.6): for independent V₁ ~ χ²_{d₁} and
V₂ ~ χ²_{d₂} with d₁, d₂ ≥ 1, (V₁ / d₁) / (V₂ / d₂) has density
Γ((d₁ + d₂)/2) / (Γ(d₁/2) Γ(d₂/2)) · (d₁/d₂)^{d₁/2} x^{d₁/2 - 1} (1 + d₁ x / d₂)^{-(d₁+d₂)/2}
on x > 0.
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