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方差参数    
相关语句
  variance parameter
    For testing linear hypothesis about regression coefficients, Banerjee and Magnus(1997) studied the sensitivity of F-test sta,tistic(FGLS( )) based on generalized least square estimate caused by variance parameter in general case and proposed sensitivity statistic and its distribution.
    关于回归系数的线性假设检验问题,Banerjee和Magnus(1997)在一般情况下从理论上研究了方差参数对基于广义最小二乘估计的F-检验统计量(F_(GLS)(θ))的种种影响,提出了敏感性的概念,并给出敏感统计量的形式及其分布。
短句来源
    By transferring the Gaussian noise variance parameter between layers and employing different filters for different sort of pixels, the algorithm can effectively improve the precision and accuracy, as well as preserving edge details.
    采用图像层间传递高斯噪声方差参数,对于不同性质的像素采用不同滤波算法,有效地提高滤波精度和准确性,并能够较强地保存图像边缘细节信息。
短句来源
    In the linear case, it is the same as the minimum variance parameter adaptive control.
    在线性情形,它与最小方差参数自适应控制律一致。
短句来源
    Based on the analysis of error characteristics and performance effect of the mostly used crystal oscillator, a method to simulate the frequency error of crystal oscillator is proposed. The major idea is to determine the Allan variance parameter of each main stochastic error component at the given sampling interval at first, then to deduct a set of corresponding frequency error series and superpose them together.
    该文对在GPS接收机中使用最多的晶振的误差特性和性能影响进行了分析,在此基础上提出了一种模拟晶振频率误差的方法,即首先确定晶振在给定取样时间间隔上各主要随机误差成分的Allan(阿仑)方差参数,由此反演产生相应的各项晶振频率误差模拟序列并进行叠加.
短句来源
    The properties of tests statistic are studied when the variance parameter is known.
    在方差参数已知的情况下,研究了检验统计量的性质;
短句来源
更多       
  covariance parameters
    REML estimation as a method of estimating covariance parameters is more effective than ML estimation when the number of regression parameters is large and covariance matrix is near-singular. Furthermore, it can detach covariance parameters from regression parameters.
    用REML方法估计方差参数,在回归参数的个数很大和协方差矩阵接近奇异的情况下比ML方法更有效,而且可以使回归参数和方差参数分离开,在推导检验统计量时只需考虑方差参数,这使问题得到简化。
短句来源
    Covariance parameters are estimated by means of REML and Score test statistics is derived.
    对于方差参数,本文采用REML的方法进行估计. 检验统计量给出的是Score统计量。
短句来源
  covariance parameters
    REML estimation as a method of estimating covariance parameters is more effective than ML estimation when the number of regression parameters is large and covariance matrix is near-singular. Furthermore, it can detach covariance parameters from regression parameters.
    用REML方法估计方差参数,在回归参数的个数很大和协方差矩阵接近奇异的情况下比ML方法更有效,而且可以使回归参数和方差参数分离开,在推导检验统计量时只需考虑方差参数,这使问题得到简化。
短句来源
    Covariance parameters are estimated by means of REML and Score test statistics is derived.
    对于方差参数,本文采用REML的方法进行估计. 检验统计量给出的是Score统计量。
短句来源
  standard deviation parameter
    Experimental results in objective evaluation show that the optimum temporal standard deviation parameter is 0.4,the optimum spatial standard deviation parameter is in a range of 1.6~2.0 under the condition that the pre-filtering window size is 5×5 pixels.
    结果显示 ,滤波窗口为 5× 5时的最佳时间方差参数为 0 4 ,最佳空间方差参数为 [1 6 ,2 0 ];
短句来源
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  variance parameter
To determine similarity between location pairs for all cultivars within each group of cultivars, an unbiased stability-variance parameter (
      
This paper suggests a variance parameter's identification technique based on the stochastic structural system analysis method and the multidimensional optimisation algorithm.
      
Linearization conditions for regression models with unknown variance parameter
      
The aim of the present paper is to use a similar approach to find simple conditions for linearization of the model in the case of a locally quadratic model with unknown variance parameter σ2.
      
If the variance of noise is small, an alternative method is also applicable which yields a suboptimal control in a power series with respect to a variance parameter.
      
更多          
  covariance parameters
Mean squared prediction error in the spatial linear model with estimated covariance parameters
      
Estimation of covariance parameters in kriging via restricted maximum likelihood
      
This article illustrates the use of linear and nonlinear regression models to obtain quadratic estimates of covariance parameters.
      
Finally, the equivalence of predictions under various models is examined when covariance parameters are estimated.
      
A constrained least-square technique is implemented for the inference of the generalized covariance and cross-covariance parameters, and a synthetic example is used to illustrate the methodology.
      
更多          
  covariance parameters
Mean squared prediction error in the spatial linear model with estimated covariance parameters
      
Estimation of covariance parameters in kriging via restricted maximum likelihood
      
This article illustrates the use of linear and nonlinear regression models to obtain quadratic estimates of covariance parameters.
      
Finally, the equivalence of predictions under various models is examined when covariance parameters are estimated.
      
A constrained least-square technique is implemented for the inference of the generalized covariance and cross-covariance parameters, and a synthetic example is used to illustrate the methodology.
      
更多          
  standard deviation parameter
A corrected 75% threshold can be computed from the standard deviation parameter r.
      
For example, if a target object bears a textured surfaces, we can eliminate textural edges by using a larger standard deviation parameter.
      
This would not be the case by choosing the standard deviation parameter of a Gaussian fit to the distributions, although the differences are minor.
      


The frequency source in Global Positioning System (GPS) receiver has a great many influence on the whole performance of the receiver. Based on the analysis of error characteristics and performance effect of the mostly used crystal oscillator, a method to simulate the frequency error of crystal oscillator is proposed. The major idea is to determine the Allan variance parameter of each main stochastic error component at the given sampling interval at first, then to deduct a set of corresponding frequency error...

The frequency source in Global Positioning System (GPS) receiver has a great many influence on the whole performance of the receiver. Based on the analysis of error characteristics and performance effect of the mostly used crystal oscillator, a method to simulate the frequency error of crystal oscillator is proposed. The major idea is to determine the Allan variance parameter of each main stochastic error component at the given sampling interval at first, then to deduct a set of corresponding frequency error series and superpose them together. The computer numerical simulation approach and the experimental results are given. This research provides related both theoretical reference and practical design for the development of an integrated design, test and evaluation platform such as a GPS signal simulator.

GPS(Global Positioning System)接收机中参考频率源的性能对接收机整体性能有着诸多影响.该文对在GPS接收机中使用最多的晶振的误差特性和性能影响进行了分析,在此基础上提出了一种模拟晶振频率误差的方法,即首先确定晶振在给定取样时间间隔上各主要随机误差成分的Allan(阿仑)方差参数,由此反演产生相应的各项晶振频率误差模拟序列并进行叠加.文中给出了计算机数值模拟的方法,并对仿真实验结果进行了分析,从而为GPS接收机设计、性能评估和测试平台如GPS信号模拟器的研制提供有关的理论支持和设计方法.

 
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