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Statistics
containing
小 的
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按与容量大小成比例的概率抽样
PPS sampling
按与容量大小成比例的概率抽样
sampling with probability proportional to size
每艘船每小时的物质生产力
hour physical productivity per vessel
每艘船每小时的物质生产力
per vessel hour physic productivity
直线的最小平方拟合
least squares fit of a straight line
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