在线（单遍）算法
通常认为计算方差需要先算出均值，再回头计算各点与均值的平方差之和。然而，方差实际上可以通过单遍扫描数据集的方式在线计算，无需存储所有数据点或进行二次遍历。这类单遍算法在数据流处理和大规模数据场景中尤为实用。
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