平方平均数(Quadratic mean),简称方均根(Root Mean Square,缩写为 RMS),是2次方的广义平均数的表达式,也可叫做2次幂平均数。其计算公式是:
在连续函数的区间内,其均方根定义为:
英语百科
Root mean square 平方平均数
(重定向自Quadratic mean)
In statistics, the root mean square (abbreviated RMS or rms), also known as the quadratic mean, is defined as the square root of the arithmetic mean of the squares of a set of numbers.
RMS can also be defined for a continuously varying function in terms of an integral of the squares of the instantaneous values during a cycle.