... 1 2 2 n x x s n i i 1 ) ( 1 2 n x x s n i i 方差和标准差(variance and standard deviation): 各变量值与均值的平均差异 根据总体数据计算的,称为总体方差或标准差,用σ表示; 根据样本数据计算的,称为样本方差或标准差...
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第四章 数据资料的统计描述: 数值计算 ... 四、方差和标准差(Variance 、Standard deviation) 五、方差和标准差(Variance 、Standard deviation) 二、调和平均数(Harmonic mean) ...
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全距,四分位距,方差和标准差。
Find range, interquartile range, variance and standard deviation for a data set.
该分析可以生成描述性统计,如:均值,方差,标准差,范围,峰度和偏度。
The analysis can generate descriptive statistics, such as: the mean, variance, standard deviation, range, kurtosis and skewness.
What we want to do now is compute the mean and variance of the portfolio-- or the mean and standard deviation, since standard deviation is the square root of the variance-- for different combinations of the portfolios.
我们现在要做的是,计算这个投资组合的均值和方差-,或者均值和标准差,因为标准差的平方就等于方差-,这对任何投资组合都是一样的。
The way you would go about it, if you're a portfolio manager, is you have to come up with estimates of the inputs to these formulas-- that means the expected returns, the standard deviations, and the covariances.
你所要做的,如果你是一个资产经理,你要做的事情就是,对公式里面的一些参数进行估计-,那些参数包括预期收益,标准差,和协方差。
I don't find that my analysis is profound in the final answer, I just took some estimates using my data and, again, we could-- if someone wanted to argue with us they could argue with my estimates of the expected returns of the standard deviations and the covariances, but not with this theory.
我在计算过程中并没有做太深入的分析,我只是用我的数据做了一下大概的估计,我再说一次,我们可以-,如果有人想就这个问题与我们争辩,他们可以争论我对期望收益的估计,或是争论标准差和协方差的估计值,但并不会针对理论本身。
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