抽样法

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.

本文采用双正态模型、有序回归模型等参数法，Cox比例风险模型半参数法，Hanley、Delong非参数法拟合了ROC曲线；文中也考虑了样本量的估计、协变量的混杂效应、再抽样技术计算ROC曲线下面积的标准误与可信区间等问题；并研究了SROC分析方法。

Firstly, the random scene of fire was assumed. And then according to the probability distributions of the random parameters of fire in the building, a large number of samples were obtained using mixed congruence method and inverse function method of Monte-Carlo. Finally, the performance of the samples was simulated using Ozone, and the failure probability of the structure in fire was analyzed.

该模型首先确定火灾随机场景，根据建筑物内火灾随机参数的概率分布，利用蒙特卡洛的混合同余法和反函数法产生火灾随机场景的抽样样本，然后利用OZone软件进行火灾下抽样样本的性能模拟，通过大量样本的模拟实现了结构在火灾下的失效概率分析。

Although the process for calculating the optimal fixed sample size is quite simple, it doesn't stop unless the last sample collected. So it has the property of the fixed overall cost.

最佳固定抽样个数法虽然计算简易，但无提早停止抽样的特性，即有固定成本性质。

The study uses literature survey, multidimensional scaling analysis, and questionnaire survey. First, the researcher divides visual situated websites into six styles, and randomly chooses samples from these ones. Through on-line questionnaire survey, the study discusses user perception on the eight constructive elements of the interfaces in visual situated websites and on the operation items as "usability","pleasure","interaction","immersion", and "memorability".

本研究采文献调查法、多元尺度法与问卷调查等法，首先将视觉情境式多媒体网页分类为六种风格，并从中挑选代表性样本，以随机抽样进行网路问卷调查，探讨使用者对於视觉情境式多媒体网页介面八项构成元素，以及使用者对操作之「使用性」、「愉悦性」、「互动性」、「沉浸性」、「易记性」等项目的看法。

The questionnaire method and the interview menthod were used to gain the tourist data, the quota sampling method was used in sampling survey, the principal component analysis method was used to measure the various variables, the statistical methods such as linear regression analysis, multivariate linear regression analysis, single factor variance analysis and logistic regression analysis were used to analyzes the relationship between various variables.

具体来说，在获取游客数据时采用了问卷调查法和访谈法，在抽样调查时采用了配额抽样方法；对各变量进行测度时使用了主成分分析法；在分析各变量之间相互关系时采用一元线性回归分析、多元线性回归分析、单因素方差分析及Logistic回归分析等统计方法。

In chapter 10, we propose the random weighting approximation method for distribution of sample mean under simple random sampling in one-dimensional finite population.

第十章 将随机加权法首次应用到简单随机抽样方案下的样本均值分布逼近问题中，从数字特征角度说明了随机加权方法在抽样理论中的可用性，从而拓广了随机加权法的应用范围。

Firstly, the paper expatiates the essence principle of the motion estimation based block matching, introduces Full Search method and several typical motion estimation fast algorithms, and analyzes each characteristic, then to sum up the key technology for increasing the motion estimation search efficiency; Secondly, it stress introduces three motion estimation fast improved algorithms: the improved algorithm based Full Search method, it imports successive elimination algorithm、subsample and termination condition to increase search speed for enhancing the real time of Full Search.

本文首先阐述了基于块匹配法的运动估计基本原理，介绍了全搜索法和几种典型的运动估计快速算法，分析了各算法的特点，在此基础上总结了提高运动估计搜索效率的几个关键技术。接着重点介绍了本文提出的三种运动估计快速改进算法。基于全搜索的改进算法，是在全搜索的基础上尝试引入了连续排除算法、子抽样和终止条件来提高搜索速度，增强全搜索的实时性。

Secondly, in application of Sampling Evaluation Method, to deal with some unquantifiable factors in Investment Climatess, a questionnaires is made in form of subjective topics, which effectively offsets the shortage of the Evaluation Index System , where some factors are not included due to difficulty in collection or quantification.

其次，采用抽样评价法，针对投资环境中一些无法量化的因素，以主观题的形式进行抽样问卷调查。

Methods:The randomly group sampling,parallet comparison and dilamination methods are used in this study.166 cases (10 falling off) was observed on giving priority to diferent treatment of yiqi yangyin,wenbu spleen and kindey,qingre jiedu and evaluate the change of different quantity arrangement of CD4~+T lymphocyte cell of different treatment of TCM on HIV asymptomatic carriers.

采用随机整群抽样、平行对照、分层研究的方法，分别以益气养阴法、温补脾肾法和清热解毒法为主对166例(脱落10例)感染者进行干预，观察中医不同治法对感染者不同层次CD4~+T淋巴细胞的变化。

The ANNs models of the periodic defected ground structures and a novel combinatorial nonperiodic defected ground structures with the characteristic of double stop band have been developed in this paper. The structure sizes of DGS and the frequencies are defined as the input samples of ANNs, the parameters of transmission coefficient calculated by FDTD method are sampled and defined as the output samples. For the PDGS with biggish structure sizes the transmission coefficients have the tiny dither owing to abnormal disturbance and the training samples have been smoothed by the least square method and five-spot triple smoothing method.

本文采用神经网络对周期性缺陷接地结构和一种新型的具有双阻带特性的组合式非周期性缺陷接地结构进行分析建模，将其结构尺寸和频率作为输入样本，对FDTD法计算出的传输系数参数进行抽样并将抽样结果作为输出样本，然后采用贝叶斯正则化算法对神经网络进行训练。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。