查询词典 estimator

First, a non-parametric density estimate method based on kernel function is adopted to estimate the statistic distribution of the SAR images, and then, the SAR images is segmented with Markovian contexture by maximizing a MAP estimator, taking the former estimation as its likelihood term.

该算法首先采用基于核函数的非参数方法估计SAR图像的统计分布，然后将此统计量作为图像分割的似然函数，利用马尔可夫上下文约束进行SAR图像分割。

The research on the CCD sensor information is used to determinate the satellite attitude system without gyroscope .(1) Using quaternion and MRP as attitude representation , the attitude kinematics function are established . The satellite attitude dynamics function is established,that is disturbed by the first-order Markov force moment.(2) Using the quaternion as attitude representations, the attitude determination state estimator EKF and UKF are designed , numerical simulation is done .

基于CCD星敏感器的无陀螺测量卫星姿态确定系统的研究(1)针对地球同步轨道卫星，分别建立了以姿态四元数和修正罗德里格参数为卫星姿态描述参数的姿态运动方程；建立了卫星受一阶马尔柯夫干扰力矩时的卫星姿态动力学方程；(2)设计了采用姿态四元数为卫星姿态描述参数的EKF和UKF估计器，设计了分别以姿态四元数和修正罗德里格参数为卫星姿态描述参数的UKF估计器，并进行了数学仿真。

An auxiliary estimator is developed to avoid ill-condition in solving Diophantine equation.

提出使用辅助估计器克服丢番方程的病态问题。

First, we obtain the empirical Bayesian estimator of the scale parameter for the double exponential distribution based on LINEX loss function and the convergence rate of the estimate.

首先利用非对称的LINEX损失函数对双指数分布族刻度参数进行了经验贝叶斯估计，并讨论了该估计的性质，给出了收敛速度。

Then an adaptive, efficient unbiased estimator of Hurst index based on multiresolution wavelet analysis and weighted regression is presented.

针对基于小波的Hurst指数估计方法的自适应问题，结合方差分析给出了一种有效的解决方法，从而提出了自适应的参数估计方法，并且该方法在一般意义上是无偏的。

If the two models display a systematic difference in the estimated coefficients, then we have reason to doubt the assumptions on which the efficient estimator is based.

同时，如果在多个 IV 中，有一个是确定为外生的，那么，可以用 Sargan test of overidentifying restrictions 来检验其他的 IV 是不是确实是外生的。

An adaptive,efficient unbiased estimator of Hurst index based on the lifting scheme for wavelet transform and correlation coefficient is presented.

对局域网和广域网上大量突发网络流量的分析结果表明，网络流量普遍存在着自相似性和长相关性，其中赫斯特指数是表征网络流量突发性的重要参数。

Finally, the fitness of Garman-Klass model and High-Low model estimators are twice efficient than historical volatility estimator.

最后我们发现，Garman-Klass 模式与高/低价模式之配适度约高出历史波动性估计式一倍左右。

If necessary, the center of the ellipsoid can be regarded as the estimator of the state vector.

在需要时，可将椭球中心看作状态估计。

The most commonly used non-parametric estimator for ROC curve is the empirical ROC curve.

因此，在医学统计中如何估计ROC 曲线一直是人们关注的研究课题。

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