...X) 2 2 n 方差(variance): 2样本方差 S2 SS X - X) ( n -1 2总体方差 S 2 SS X - X) ( N 标准差(standard deviations): SS S S2 适用于近似正态分布。 p.s.1、可用于合并资料的直接计算 2、与均数结合可以完整概括一个正态分布。
基于136个网页-相关网页
POSSIBLE OUTCOMES AND STANDARD DEVIATIONS 可能结果与标准差 ; 可能结果与程序差
calculate using the standard deviations 使用标准偏差计算 ; 计算使用的标准偏差
the relative standard deviations 相对标准偏差
combining standard deviations 组合标准<偏>差
implied standard deviations 隐含标准差
pooled standard deviations 合并标准差
weighted standard deviations 加权标准差
gaussian standard deviations 高斯标准误差
relative standard deviations 相对标准偏差
All results were expressed as means±standard deviation.
实验数据以均值±标准差表示。
参考来源 - 十全大补汤对阿尔茨海默病中小胶质细胞作用的实验研究05% and the relative standard deviation is 0. 077% .
采用新的测定方法测定萘的燃烧热,测定结果的相对误差为0.05%,相对标准偏差为0.077%。
参考来源 - 有机物燃烧热测定方法的改进The implemetation of portfolio insurance strategy can obtain the highest of the excess yield of the fund’s standard deviation.
对于股票型基金来说实施投资组合保险策略获得的基金份额标准差的超额收益率是最高的。
参考来源 - 基于基金配置策略的基金业绩研究The results state that Web Services using buffering technology and lifecycle management have got a better performance and reliability than Axis according to the aspects of throughput, average response time and standard deviation.
结果表明使用了缓冲技术和生命周期管理的Web服务管理框架在吞吐量、平均响应时间和标准偏差值等主要性能指标上都较Axis有明显的改进。
参考来源 - Web服务管理框架的设计与实现Then, change the two markets’price of standard deviation and mean, check the distribution ratio’s data changes.
然后,分别改变两市场电价的标准方差和均值,来看分配比的数据变化情况。
参考来源 - 电力市场配电侧购电分配问题的研究及其风险分析·2,447,543篇论文数据,部分数据来源于NoteExpress
N a measure of dispersion obtained by extracting the square root of the mean of the squared deviations of the observed values from their mean in a frequency distribution 标准偏差 [statistics]
And give two standard deviations from your answer.
从答案里给出两个标准差。
The Gran Sasso team's result is six standard deviations.
而格朗萨索研究组的结果是六个标准差。
The standard deviations were always impossible to measure (typical of microbenchmarks).
标准偏差总是不可能度量的(微基准测试的典型情况)。
One standard deviation happens one draw out of three, two standard deviations one out of twenty, three standard deviations is one out of one hundred.
落在一个标准偏差之外的概率是1/3,两个标准差之外的概率是1/20,三个标准差之外是百分之一
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。
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。
应用推荐