价格差异 price discrepancy; price industrial; price variance; value variance 材料价格差异 material price variance; materials price variance ..
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expected value & variance 期望值与方差
random value variance [计] 随机值变化
residual value variance estimator 残余价值
phenotypic value variance 表型方差
average value-variance model 均值
variance optimum value 方差最优值
From the study on value variance, we get some enlightenment: First, close connection and advance depending each other are the relation among society, value and college entrance examination policy;
从对价值观念变迁的研究中,我们 得到几点启示:第一,紧密联系、互动前进,是社会、价值观念、高考政策三者之间的关系;
The variance of a random variable measures how far from the expected value its values typically are.
随机变量的方差衡量随机变量值与期望值偏离的程度。
Expected value is good and variance is bad because that's risk; that's uncertainty.
期望值越高越好,方差就相反,因为方差代表着风险,也就是不确定性
Expected value is good and variance is bad because that's risk; that's uncertainty.
期望值越高越好,方差就相反,因为方差代表着风险,也就是不确定性
We want a high expected value of returns, but we don't like variance.
我们希望收益的期望值较高,并且稳定
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