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方差的意义
更新时间: 2021-01-27 14:09:26  

1、方差的意义在于:它反映了一组数据与其平均值的偏离程度。

2、方差是在概率论和统计方差衡量随机变量或一组数据时离散程度的度量。概率论中方差用来度量随机变量和其数学期望(即均值)之间的偏离程度。统计中的方差(样本方差)是每个样本值与全体样本值的平均数之差的平方值的平均数。方差是衡量源数据和期望值相差的度量值。

关键词: 意义

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