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送交者: BerkeleyWolf 于 2008-03-05, 23:23:32:

回答: 为什么没有几何中间值这个概念? 由 HunHunSheng 于 2008-03-05, 14:55:06:

from wiki:
:"In probability theory and statistics, a median is described as the number separating the higher half of a sample, a population, or a probability distribution, from the lower half. The median of a finite list of numbers can be found by arranging all the observations from lowest value to highest value and picking the middle one. If there is an even number of observations, the median is not unique, so one often takes the mean of the two middle values."

In the last sentence, it is not specified the mean of the middle two must be arith. mean, so for even number case, I think you can define geometric median if you want, why not.




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