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
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。
You'd have a higher expected return with no more variance.
你的预期收益率提高了，但风险没有增加。
The equally-weighted case that I gave a minute ago was one where the two assets had--were at the same-- had the same expected return and the same variance; but this is quite a bit more general.
我刚刚举的相同权重的例子,表示两种资产-,有相同的预期收益和相同的方差;,但这种情况更加普遍一些。
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
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The quadratic method to food spot which gains made the variance computation, rejected noise spots which were apart from other normal spots, so that it obtained the expected food distribution position.
二次方差法对已获取的食物点作方差计算，快速剔除距其他点较远的噪声点，获得食物分布的期望位置。
Some variance of temperature is to be expected.
预料气温会有些变化。
Depending on where the assets expected returns are and the assets' standard deviations, we can see that we might be able to do better than — have a lower variance than either asset.
根据资产的预期收益，以及收益的标准差，可以看到我们有更好的选择，这里的方差值比以上两种方案都要低。
The stop-loss reinsurance as one way of reinsurance can make insurers obtain the highest expected effectiveness but the lowest risk variance.
停止损失再保险作为一种再保险方式，在具有相同保费的前提下，能使保险人的期望效用最大，并能使其自留风险方差最小。
Remarkably, cortisol increased in direct correlation to implied volatility, a measure of expected future variance in asset prices.
出乎意外地的是，皮质醇上涨与用来测量预期将来资产价格变动的隐含波动率呈正相关。
The material price variance measures the difference between the actual cost of material and the standard cost expected to be paid for the material.
材料的价格差异是材料的实际价格与预期的标准价格之间的差额。
The material price variance measures the difference between the actual cost of material and the standard cost expected to be paid for the material.
材料的价格差异是材料的实际价格与预期的标准价格之间的差额。
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