引入均方差的概念，建立了抽运光功率分布均匀性判定方法。

A method to estimate the distribution of pump power is bring up.

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在计算最近邻时，引入了兴趣方差的概念，提高了计算最近邻的准确度。

Moreover, the concept of interest variance is adopted to improve the veracity of searching nearest neighbors.

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另一个基本的概念是协方差。

Another concept that's very basic here is covariance.

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I feel like I have to introduce concepts like variance and co-variance and correlation in order to talk about finance; so that's what we'll do in Lecture Two.

我会讲到像方差,协方差,相关系数,这样的概念,为金融学的内容作一些铺垫,我们会在第二课讲到

耶鲁公开课 - 金融市场课程节选

Another concept that's very basic here is covariance.

另一个基本的概念是协方差

耶鲁公开课 - 金融市场课程节选