There's no radical sign, because we're not taking the standard deviation.
没有激进的迹象,因为我们没有采用标准偏差。
英语百科
nth root
In mathematics, the nth root of a number x, where n is a positive integer, is a number r which, when raised to the power n yieldsx
where n is the degree of the root. A root of degree 2 is called a square root and a root of degree 3, a cube root. Roots of higher degree are referred by using ordinal numbers, as in fourth root, twentieth root, etc.
近义、反义、联想词
近义词
n.
mathematical notation
英英词典
radical sign n.
a sign placed in front of an expression to denote that a root is to be extracted