查询词典 parametric estimation

For fitting ROC curves and getting the area under the ROC curve, we applied the parametric methods of binormal models and ordinal regression models, the semiparametric method of Cox proportional hazards model, the nonparametric methods of Hanley, Delong This paper also include estimation of required sample size, evaluation of confounding effects, and estimation of standard error and confidence interval by resampling method for ROC analysis.

目前该模型用于ROC分析的统计学方法比较完善，属于"经典"的ROC分析参数法。本文探讨了单变量、双变量双正态ROC模型的构建及其参数的最大似然估计方法；采用双变量卡方检验、真阳性率z检验、面积z检验三种方法比较了ROC曲线间是否具有显著性差异。

We apply the kernel methods of regression functions and conditional density functions to obtain a series of as the estimators of . Then using Monte Carlo Analysis method , we can get the optimal choice of the unknown parametric that is . Examples illustrate the models and will show this estimation is effective.

应用回归函数核估计和条件密度函数的核估计方法估计未知量，将得到的一组估计值用Monte Carlo Analysis方法处理便得到最优的，并通过算例模拟讨论以上估计方法的优劣。

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。

A procedure for the parameter estimation of nonlinear parametric structural system is presented.

本文对基于时域信息的非线性参数系统参数识别问题进行了研究。

This thesis also studies a type of dynamical systems called Lorenz-type ODE having chaotic attractors and provides a nice estimation for the chaotic parametric region.

本文还分析了一类具有混沌吸引子的Lorenz型ODE，较好地估计了混沌参数区域。

First , it presents the estimations of model parametric and contamination parametric respectively by using moment estimation method.

首先利用矩方法给出了两种污染方式下污染参数及污染系数的估计。

Second, we research the Baum-Welch algorithm of modified HMM and derive the update parametric estimation equations for modified HMM based on traditional HMM.

其次，在传统的隐马尔可夫模型的基础上，研究了改进的模型的前向-后向算法和Baum-Welch算法，并导出了改进的模型的参数估计公式。

In order to locate the point target found timely and satisfy the need to obtain information and respond quickly, this paper proposes an algorithm for the latitude and longitude of point targets so that given the known parameters, the latitude and longitude of a point target can be calculated on the SAR image at the earliest possible time. This paper also offers parametric estimation of and experimental research on the precision of the algorithm.

为了及时对发现的点目标进行定位，适用于未来战争战场信息获取和快速反应的要求，本文针对SAR在正侧视和小斜视情况下的成像算法提出了机载SAR成像场景中的点目标经纬度的计算方法，使得我们能第一时间在SAR图像上根据所知参数计算出所需点目标的经纬度，并就该方法的精确性进行参数估计和试验研究，验证了其有效性。

The first section is introduction; the second and the third sections discuss the parametric estimation; the fourth section is about the choice of factors, model test and characteristic model; the application of factor model in risk management will be discussed in the last section.

具体内容安排如下：第一章首先介绍本文研究的理论与现实意义；然后基于SDF定价框架，详细地论述了本文所要研究四个问题的内在联系，同时也为本文后面的模型讨论提供了一个框架；最后给出本文的研究主要内容和主要创新之处。

Referring to a measuring network composed of two or more photoelectric theodolites, an approach for precision analysis based on Cramer-Rao Lower Bounds of target position parametric estimation is proposed and the principles to locate the netted photoelectric theodolites is also given in the paper.

在由多台光电经纬仪组成的测量网中，提出一种基于目标位置估计Cramer-Rao限的精度分析方法，并给出了光电经纬仪组网测量布站应遵循的原则。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。