Timeline for Is there a universal bound for this ratio of expectations?
Current License: CC BY-SA 3.0
3 events
| when toggle format | what | by | license | comment | |
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| Jul 26, 2017 at 16:34 | vote | accept | Math_Y | ||
| Jul 26, 2017 at 16:34 | |||||
| Jul 26, 2017 at 16:02 | comment | added | David Harris | Also, this bound is tight. Suppose $X$ and $Y$ are $-1, +1$ with probability $1/2$. Then $|X+Y| = 2$ with probability $1/2$ and $0$ otherwise, while $|X| = |Y| = 1$. | |
| Jul 26, 2017 at 15:56 | history | answered | Aleksei Kulikov | CC BY-SA 3.0 |