Abstract
Let $\{S_n; n \geqslant 1\}$ denote the partial sums of i.i.d. random variables and let $\{n_k; k \geqslant 1\}$ be a (strictly) increasing subsequence of the positive integers. We determine necessary and sufficient conditions for $E \sup_k|S_{n_k}/n_k| < \infty$.
Citation
Allan Gut. "On the Integrability of $\sup|S_n/n|$ for Subsequences." Ann. Probab. 7 (6) 1059 - 1065, December, 1979. https://doi.org/10.1214/aop/1176994900
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