It is also called the geometric mean. When n positive numbers are x 1 , x 2 , ..., x n , the nth root G of their product is called the geometric mean. It is used as one of the representative values in statistics. In this case, it is the geometric mean of the variables x 1 , x 2 , ..., x n when the frequencies are all 1, but if the frequencies of each variable are f 1 , f 2 , ..., f n , the weighted geometric mean is given by N=Σf ith root G of the product of each x i raised to the power of f i . Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
相乗平均ともいう。 n 個の正の数を x1,x2,…,xn とするとき,それらの積の n 乗根Gを幾何平均という。これは統計学における代表値の一つとして用いられる。この場合は,度数がすべて1のときの,変量 x1,x2,…,xn に関する幾何平均であるが,各変量のそれぞれの度数が f1,f2,…,fn であれば,その重みつき幾何平均は各 xi の fi 乗の積の N=Σfi 乗根Gで与えられる。
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