查询词典 covariance matrix

In a special case of 2 dimensional variables, the probability of the positive definitiveness of the discrete sample covariance matrix is given in term of sample size and variable dimension. Based on the results, the optimal sample size is provided in this thesis.

推出了离散型样本协方差矩阵正定的充要条件，得到了求离散型样本协方差矩阵正定概率的模型，建立了特殊情况下的抽样优化模型。

This thesis discussed the positive definitiveness of the covariance matrix of sample whose variables are discrete data by using p-vector match, I-Linear combination and their properties.

对于变量取离散数据的样本协方差矩阵的正定性，很少有学者进行研究。

It deriver the test methods based on the point estimations of the marginal proportions and the covariance matrix of the points estimations in 2×2 table.

这类问题可以归结为：设第一次观察的结果记为Y1 ；第二次观察的结果记为Y2 。其中，Y1 和Y2 都是随机变量，两者的可能取值都为 1和 2。

The hidden Markov model based on diagonal covariance matrix Gaussian distributions is at present the most popular and successful model in speech recognition.

状态输出概率密度为对角协方差矩阵高斯分布的隐马尔可夫模型在帧内特征相关建模方面存在缺陷。

Using real-valued decomposition technique, Unitary Cyclic root-MUSIC algorithm without spectral search was proposed for multipath environment of mobile communication, by reconstructing the data model of the cyclic covariance matrix with Hermitian property, which has a better performance in the presence of multipath propagation and substantially reduces the computational complexity.

通过构造了循环自相关矩阵的数据模型，使其具有厄尔米特特性，提出了一种基于实值分解技术的循环root-MUSIC算法，无需空间谱搜索，较好地解决了多径传播环境中信号高度相关问题，极大地降低了计算量。

The premise of the superiority of the conventional statistical STAP is to have ample training samples with interference that are independently and identically distributed with interference in the test sample, in order to estimate the covariance matrix.

常规的统计STAP方法性能最优的前提条件是具有足够的与待检测样本中的干扰独立同分布的训练样本，以便估计协方差矩阵。

In the beamformer based on sample covariance matrix inverse algorithm, the calculation of weight vector comprises the components of interferences and noise. The projection method comprises the components of interferences. It induces the imperfective results of the beamformer.

摘要基于协方差矩阵加权的波束形成方法在计算加权向量时引进干扰和噪声的影响，投影方法在计算加权向量时引进干扰信号的影响，这些都造成了波束形成效果的不理想。

The one order differential model and convolutional model of impedance formula of amplitude versus offset inversion were established. Impedance inversion formula from AVO was derived based on Bayesian framework. Methods of using Huber function as prior model parameter distribution and covariance matrix from well log as constrains were developed. The P-wave impedance, S-wave impedance and density were calculated by the conjugate gradient algorithm.

为此建立了振幅随偏移距变化波阻抗反演公式的一阶差分模型及褶积模型，推导了基于贝叶斯理论的AVO波阻抗反演公式，给出了采用Huber分布作为模型参数的先验分布及测井数据的参数协方差矩阵作为约束条件的实现方法，并利用共轭梯度法计算了纵、横波阻抗及密度。

We will demonstrate the specification of reference prior distribution on the random covariance matrix. We will consider the approximate uniform shrinkage prior and approximate Jeffreys' prior. Both are formulated based on the approximated likelihood function. Under generalized linear mixed models, we show that the posterior mode under Jeffrey's prior is asymptotically closer to the REML estimate than the mode under uniform shrinkage prior does.

在广义线性混合模式下，我们证明了在样本数很大时，随机效应之变异数成份的后验众数和REML估计值会近似相等，同时也建立了后验众数和REML估计值的近似关系式，并提出了比较二种后验众数与REML估计值之间远近的准则。

Taking mapping QTL that affect leaf age growth trajectories in rice of a DH population as an example, we used 3 biological meaningful submodels and 2 orders Legendre polynomial to model the mean vector of QTL genotypes and 11 stationary and non-stationary models to fit residual covariance matrix.

以水稻一个DH群体的叶龄性状为例，我们分别用3个具有生物学意义的子模型和2阶Legendre多项式去拟合QTL基因型的均方向量，用13个平稳和非平稳模型去描述剩余协方差的变化。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了