The term variance refers to a statistical measurement of the spread between numbers in a data set. More specifically, variance measures how far each number in the set is from the mean (average), and thus from every other number in the set. Variance is often depicted by this symbol: σ2.
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What do you mean by variance?
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Is variance mean deviation?
In probability theory and statistics, variance is the expected value of the squared deviation from the mean of a random variable. The standard deviation ...
方差
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方差又称变异数、变方，在概率论及统计学中，描述的是一个随机变量的离散程度，即一组数字与其平均值之间的距离的度量，是随机变量与其总体均值或样本均值的离差的平方的期望值。方差在统计中有非常核心的地位，其应用领域包括描述统计学、推论统计学、假设检验、度量拟合优度，以及蒙特卡洛采样。 维基百科
中国大陆： 方差
台湾： 变异数
日本、韩国： 分散
2023年1月18日 · The variance is a measure of variability. It is calculated by taking the average of squared deviations from the mean. Variance tells you the ...
时长： 10:24
发布时间： 2020年5月20日
发布时间： 2020年5月20日