... 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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Variance and standard Deviation(方差与标准差) Return(期望收益) :Arithmetic mean of historical return(算术平均的
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Population variance and Standard deviation 总体方差和标准差
Find range, interquartile range, variance and standard deviation for a data set.
全距,四分位距,方差和标准差。
Furthermore, the average, variance and standard deviation are processed to testify the existence, occurrence stability and influence of each hypothetical role.
进而得出每种假设角色的平均值,方差及标准差验证该假设角色的存在性、出现频率的稳定性以及对各个片断的影响程度。
RANDN (n) is an N-by-N matrix with random entries, chosen from a normal distribution with mean zero, variance one and standard deviation one.
是一个n - n矩阵随机作品,选自正态分布均值为零,方差一个标准偏差为一。
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。
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