正态分布

F的正态分布特性则由模拟随机数据的研究加以证实。

The normal distribution characteristics of F is checked with the aid of a simulation study .

基于EM算法的混合正态分布的参数求解及定阶问题的探讨

Discussion on Parameters and Fixed-Order Problem of Mixed Normal Distribution Based on EM Algorithm

常用的幅度分布模型有瑞利分布、对数正态分布、威布尔分布和K分布。

Rayleigh distribution , LogNormal distribution , Weibull distribution and K distribution are four distribution models commonly used .

正态分布族的参数的线性经验Bayes估计

Linear Empirical Bayes Estimators for the Parameters of Normal Distribution Family

正态分布相关系数的二次经验Bayes估计

A quadratic empirical Bayes estimator of correlation coefficient of two normal distributions

论文利用MonteCarlo方法，计算节点疲劳寿命服从对数正态分布时，n个节点的最小值的分布，给出了分布函数的具体表达式。

Monte Carlo method is used to calculate a function which is a formulation about a number of joints .

结果：郑州市汉族健康人群与DMCAD患者血清ArE/PON1活性频数均呈单峰正态分布；

Results : Serum ArE / PON1 activity distributions in healthy group and DM-CAD group were all normal distribution .

没有基变换时的指数分布和标准正态分布的k值均小于0.5，它们对随机参量的逻辑值呈偏小估计。

And k is smaller than 0.5 for exponential distributions and normal distributions without radix conversion , which means the smaller logic values of random parameters .

方法用正态分布小样本容量的简化检验（A法）和方差检验（B法）来判定两种测定方法所得结果的异同。

Methods The simplified test of normal distribution ( method A ) and analysis of variance ( method B ) were adopted to judge if the two testing methods have variation .

当可靠度特征量满足正态分布时，其分布参数（μ，h）的共轭型先验分布为正态伽玛分布。

When the pertinent parameter involved in reliability definition complies with normal distribution , the conjugate prior of its distributing parameters (μ, h ) is of normal-gamma distribution .

利用对数正态分布图获得了Pb、Cu、Zn、V、Se和Ti等元素的地球化学背景值。

The geochemical background levels are obtained by applying lognormal distribution plots to Pb , Cu , Zn , V , Se and Ti .

由正态分布W检验统计量的思想出发，给出了用于检验Pareto分布的R~2检验统计量。

According to the thought of W testing statistics for Normal Distribution , we deduce a R2 testing statistics for Pareto Distribution .

DH群体各性状变异丰富，大部分表现出明显的超亲分离，同时表现为正态分布。

Most traits in DH population showed transgressive segregation and demonstrated the normal distribution . 5 .

结果表明σs，σb，ψ，δ服从正态分布，同时对各参数进行了点估计和区间估计。

It is verified that the distributions of σ s , σ b , ψ, δ is normal . The point estimation and the region estimation of the parameters were also determined for each distribution .

此外，还建立对数寿命标准差和Weibull分布形状参数之间的关系式，从而能够根据工程上积累的大量对数正态分布标准差上限的数据求得Weibull分布形状参数下限，反之亦然。

A relational expression between the standard deviation of logarithmic life and the shape parameter of Weibull distribution is also established .

2通过对农场477个有效土壤采样点土壤有效养分以及pH值的常规统计，发现土壤养分属性并不完全呈正态分布，土壤有效磷和有效钙含量呈对数正态分布；

Conventional statistics of soil nutrients and pH value of 477 sampling sites showed the distribution of soil nutrient was not always normal . Available P and Ca had logarithmic normal distribution .

AFM图像显示：壳聚糖分子和加过金属银离子的壳聚糖分子在聚集生长过程呈现为传统的具有分形特征的正态分布和奇异分布；

AFM images show that chitosan aggregates and those absorbs Ag ~ + with fractal characteristics of traditional normal distribution and singular distribution .

林分直径分布，幼龄林呈倒“J”型，壮龄林近似于正态分布；

The stand diameter distribution of juvenile stand appears an inversed " J " form , and that of the half mature forest approximately a normal distribution .

结果表明该海区的观测资料前后有差异。海区的波高比较符合两参数的Weibull分布，波浪周期符合对数&正态分布。

The results indicate that the two-parameter Weibull distribution fits the wave heights well , while the lognormal distribution fits the wave periods well .

方法应用基于分析结果正态分布的z-值（z-score）质量控制评价方法对全国25个保健食品功能成分检测实验室的钙分析质量进行评价。

Methods Quality control method of z-score based on normal distribution was employed .

利用对数疲劳寿命符合正态分布的特性，可靠度一定时，可借助单侧容限系数给出具有置信度r的对数疲劳寿命。

According to the fatigue logarithm life tallys with normal distribution , once given the reliability , the one side tolerance factor can be used to solve the fatigue logarithm life with the confidence level r .

当误差服从正态分布时，稳健估计方法与OLS基本一样好。

When the errors follow a normal distribution , the robust estimation method is essentially as good as OLS .

本文将EM算法用于随机右删失数据下指数分布、Weibull分布和对数正态分布的参数估计中。

In this paper , EM algorithm is used to estimate the parameters of exponential distribution , Weibull distribution and lognormal distribution based on randomly right censored data .

从255个双单倍体株系抗旱鉴定结果看，该群体表型呈单峰连续分布，符合正态分布，表明叶片卷曲度在DH群体中呈现数量遗传的性状。

The result indicates that the leaf rolling presents quantative genetic character in the DH population because the phenotype distribution accords with normal school .

设X是一个服从标准正态分布的随机变量，即X～N（0,1），本文给出两类非线性函数f（x），使得f（X）仍然服从标准正态分布。

Let X be a standard normal random variable . This paper gives two classes of nonlinear functions f ( x ) with the properties that f ( X ) is also a normally distributed random variable .

对于车辆零部件在随机变量服从正态分布和非正态分布时，利用JC法求出可靠度。

The reliability of vehicle components is obtained by using JC method when basic random variables are normal distribution or non-normal distribution .

通过模型的比较分析，得到基于稳定分布的ARCH类模型比基于正态分布、t分布的ARCH类模型能更好地刻划金融时间序列的特征。

It is found from the comparison that the ARCH type models with stable Paretian innovation is more capable to capture characteristics of financial time series than ARCH type models with normal and student 's t innovations .

结果青年军人BHR的分布不符合正态分布规律。

Results BHR of youths in military service didn 't coincided with normal distribution .

给出各种可靠度下的RSN曲线估算式，并与对数正态分布处理的结果进行了比较，对海上石油钻井平台的安全性评估具有一定的意义。

Life estimate formulas for R S N curve are derived based on the Weibull distribution , and the results are compared with the result based on logarithmic mormal distribution . It is possible to predict thd safty and reliability of offshore structure .

该方法克服了Davies方法中存在的一些问题，尤其适用于二维非正态分布序列的建模和模拟。

Some limitations existing in the Davies ' method are overcame in this method and it especially suited the modelling and simulating of two dimension .