But the system variance is going to be on the order of the square root of N times epsilon.

但是系统能量的变化量大约,会是N的平方根乘以ε

youdao

RANDN (n) is an N-by-N matrix with random entries, chosen from a normal distribution with mean zero, variance one and standard deviation one.

是一个n - n矩阵随机作品，选自正态分布均值为零，方差一个标准偏差为一。

youdao

.. I started out with the equally-weighted-- I was talking about stocks-- about n stocks that all have the same variance and are all independent of each other.

开始的时候我讲了等权重的-,我开始时讲了股票-,几支拥有相同方差的股票,彼此间相互独立。

耶鲁公开课 - 金融市场课程节选

They divide by n-1 to make it an unbiased estimator of the population variance, but I'm just going to show it in a simple way here.

当除以n-1表示的是对总体的,无偏估计,我在这里只是说的简单一点

耶鲁公开课 - 金融市场课程节选