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Best lower bound on the probability of a binomial exceeding its expectation. (English) Zbl 1483.60035

Let \(X\sim Bin\, (n,p)\), and \(c = \ln(4/3)\). In this article, the author proves that \[\mbox{ if} \quad \frac{c}{n}\leq p < 1, \quad \mbox{ then } \quad P\left(X > E[X]\right) \geq \frac{1}{4}. \] The value of \(c\) is optimal. This result is a slight improvement of a result of S. Greenberg and M. Mohri [Stat. Probab. Lett. 86, 91–98 (2014; Zbl 1293.60024)].
“The inequality plays an important role in a variety of contexts, including the analysis of relative deviation bounds in learning theory and generalization bounds for unbounded loss functions.”

MSC:

60E15 Inequalities; stochastic orderings
60C05 Combinatorial probability

Citations:

Zbl 1293.60024

References:

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