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加重 定義

The weighted average or weighted arithmetic mean is similar to an ordinary arithmetic mean (the most common type of average), except that instead it is used in computing a kind of arithmetic mean of a set of numbers in which some elements of the set carry more importance (weight, frequency, or relative importance) than others. The notion of weighted mean plays a role in descriptive statistics and also occurs in a more general form in several other areas of mathematics.

すべての重みが等しい場合、重み付き平均は算術平均と同じです。加重平均は一般に算術平均と同じように動作しますが、たとえばシンプソンのパラドックスで捉えられているように、直感に反する特性がいくつかあります。