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Weighted median : ウィキペディア英語版 | Weighted median
In statistics, a weighted median of a sample is the 50% weighted percentile. It was first proposed by F. Y. Edgeworth in 1888. Like the median, it is useful as an estimator of central tendency, robust against outliers. It allows for non-uniform statistical weights related to, e.g., varying precision measurements in the sample. == Definition == For distinct ordered elements with positive weights such that , the weighted median is the element satisfying: and . If then the weighted median is Where is the next element with non-zero weight. This is a generalization of the standard median which is the weighted median of a set of elements with equal weight.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Weighted median」の詳細全文を読む
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