trimmed mean

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In statistics, the arithmetic mean calculated after eliminating a specified proportion or percentage of the largest and smallest scores, a common type being the 5 per cent trim. It is used occasionally when the set of scores contains values that are much smaller or much larger than the rest, because in such cases it yields a more useful indication of central tendency than the untrimmed mean. It was introduced in 1962 by the US statistician John Wilder Tukey (1915–2000).

Subjects: Probability and Statistics — Psychology.

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