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- 2011-7-11
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2#
发表于 2011-7-13 16:41
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| It has a long tail on right side, fig in the books are not drawn to exact specifications. mean> median, more then half of the deviations from the mean are negative and less than half are positive. In order the sum to be positive, losses must be small and gains must be large. Average magnitude of positive deviation> average magnitude of negative deviations. |
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