样本中各数据与样本平均数的差的平方和的平均数叫做样本方差;样本方差的算术平方根叫做样本标准差。样本方差和样本标准差都是衡量一个样本波动大小的量,样本方差或样本标准差越大,样本数据的波动就越大。
加权平均方差 Weighted mean square ; MSWD
最小平均方差 minimum mean square error
平均方差图 average variogram
平均方差目标 average variance criterion
样本平均值与方差 sample mean and variance
平均平方误差 mean square error ; Error mean square ; MSE ; mean_squared_error
离均差平方和 SS ; DEVSQ ; sum of sguares of deviation from mean ; sum of squares
平均差方 Mean square deviation
要理解边界上的平均方差真正的含义是非常重要的。
It's very important to understand what the mean-variance frontier actually means.
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。
This example shows two chunks with the same length, variance, and average word length.
图1:平均值为3且方差为1的正态分布。
I computed the returns on the stocks, bonds, and oil for every year from 1983 and I computed the average returns, which I take as the expected returns, I took the standard deviations, and I took the covariance.
我计算了从1983年以来每年的股票,债券和石油的收益,从而得出平均收益率,这些平均收益率作为预期收益率,然后算得标准差及协方差。
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