In selective masking smoothing algorithm, it is needed to calculate grayscale average and variance of a large number of image Windows.
在选择掩模平滑算法中，需要计算一幅图像的大量局部窗口的灰度均值和方差。
The polygene system which controls quantitative trait was generally studied as a whole for a long time. Average and variance were used to reflect the heredity of quantitative trait.
长期以来，通常将控制数量性状的多基因体系作为一个整体来研究，用平均值和方差来反映数量性状的遗传特征。
This example shows two chunks with the same length, variance, and average word length.
这个例子展示了两个拥有相同长度，方差和平均单词长度的chunks。
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