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interquartile mean : ウィキペディア英語版
interquartile mean

The interquartile mean (IQM) (or midmean) is a statistical measure of central tendency based on the truncated mean of the interquartile range. The IQM is very similar to the scoring method used in sports that are evaluated by a panel of judges: ''discard the lowest and the highest scores; calculate the mean value of the remaining scores''.
==Calculation==
In calculation of the IQM, only the data in the second and third quartiles is used (as in the interquartile range), and the lowest 25% and the highest 25% of the scores are discarded. These points are called the first and third quartiles, hence the name of the IQM. (Note that the ''second'' quartile is also called the median).
: x_\mathrm = \sum_+1}^}
assuming the values have been ordered.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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