而协方差是对2组数据进行统计的,总体方差计算公式：有关协方差公式:标准差公式:,以上四式可分别写成cov(x,2x)=E(2x^2)-E(x)E(2x)=2Ex^2-2ExEx=2Dx --1cov(2y,3y)=E(6

高斯分布（二元高斯分布）原创2021-05-31 14:47·DataStrategyThe clustering model most closely related to statistics is based on distribution models. Clusters can then