Monotone tail and moment ratio properties of Student's family of distributions

Abstract

Let Gp denote the tail function of Student's distribution with p degrees of freedom. It is shown that the ratio Gq(x)/Gp(x) is decreasing in x>0 for any p and q such that 0<p<q∞. Therefore, Gq(x)<Gp(x) for all such p and q and all x>0. Corollaries on the monotonicity of (generalized) moments and ratios thereof are also given.

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