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- This allows us to choose the best estimator among all, or at least a broad class of, the unbiased estimators. 了解这一点(分布的分散程度),将对我们如何能够在所有的估计量中,或至少在无偏估计量这一类估计量中选出最优的一个具有一定的指导意义。
- Futures price is the unbiased estimate of expected spot price, which is based on the function of risk transferring. 期货价格是未来现货价格的无偏估计,这是建立在风险转移功能基础之上的。
- When Gauss-Markov assumptions hold, we need not look for alternative unbiased estimators. 当高斯-马尔科夫假定成立时,我们不需要再去找其它无偏估计量了。
- A new method for unbiased estimating standard deviation of strength of concrete of inspected lot is proposed in this paper. 给出了一种混凝土验收批强度标准差的无偏估计方法。
- Unbiased estimators are not necessarily consistent, but those whose variances shrink to zero as the sample size grows are consistent. 无偏估计量未必是一致的,但是那些当样本容量增大时方差会收缩到零的无偏估计量是一致的。
- A more accurate and unbiased estimation of case fatality for SARS can be obtained with a third method, survival analysis. 一种对SARS病例病死率更准确和广为接受的估计可以用第三种方法即生存分析得到。
- 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.
- The superiority of Bayes LUE over ordinary best linear unbiased estimator is investigated under mean square error matrix (MSEM)criterion. 英文摘要: The unique Bayes linear unbiased estimator (Bayes LUE) of estimable functions is derived for the singular linear model.
- Thus, it is necessary to investigate the impacts of selection upon linkage analyses in order to obtain unbiased estimates of QTL position and effect. 为获得QTL位置及其效应的无偏估计,有必要研究选择对连锁分析实验所造成的影响。
- This article plans to use the Warner model randomization technology to solve this problem. Proof and the formula on unbiased estimate and the sample size are given. 运用沃纳模型(Warner model)随机化回答技术解决这一问题;并就该方法给出了无偏估计的证明和样本量的计算公式.
- The Kalman filter algorithm is derived step by step to obtain the unbiased estimates without making a prori assumption over the distribution of process and measurement noise. 卡曼滤波器演算法无需假设处理误差与量测误差的机率分布,而由逐次输入的量测值得到一无偏差之土壤溼度估计值。
- Then the estimates obtained in all the steps were combined by carrying out the best linear unbiased estimation (BLUE) to further improve the estimation accuracy. 最后利用最佳线性无偏估计(BLUE)方法将各步估计值进行最佳合并,进一步提高估计精度。
- Enlightened by the idea of AIC, this paper treats the data of the same group as samples of certain distribution. In this way, it determines the number of groups by seeking the asymptotically unbiased estimate of Kullback-Leibler information. 在AIC准则思想的启发下,将应该同属于一个分类的数据看作是在某一分布中抽取的样本,从而通过求Kullback-Leibler信息量的渐近无偏估计而达到确定类数与数据分类的目的。
- We use the quotient of the determinant of the variance-covariance matrix of the feasible unbiased estimates,that is ,a kind of relative efficency to compare these esti-mates. The results have instructive significance for practice. 我们应用这些估计的协方差阵的行列式之商,即一种相对效率比较了这些估计的优劣,所得结果对实际应用具有一定指导意义。
- The estimation of the probability P(X> E(X))=1-F(E(X)) is discussed in this article. Some strong consistent estimators are proposed, and it is shown that no reasonable unbiased estimate exists. 本文讨论了概率P(X>E(X))=1-F(E(X))的估计问题;提出了一些强相合估计;同时也就证明了不存在合理的无偏估计.
- A two-stage method for system identification based on asymptotic theory was proposed.Firstly, an unbiased estimation and its frequency variance were obtained by the high-order ARX model. 提出了一种基于渐近理论的两阶段过程辨识方法:先用高阶模型得到无偏估计和频域方差;
- The results indicate that if all the investors all full rational,the equilibrium price,whether using close call auction or open call auction,is the unbiased estimator of the risky assets true value. 研究结论表明;若所有的投资者都是理性的;无论采用封闭式集合竞价还是开放式集合竞价;那么均衡价格均是风险资产真实价值的无偏估计量.
- The heteroscedasticity regression equation is established and the best linear unbiased estimators for the regression parameters, the standard deviation and their covariance are also given. 文中建立了异方差回归方程,给出回归系数和标准差的最佳无偏整体估计及其协方差矩阵。
- Based on the unbiased estimate of realized variance under serially correlated noise proposed by Hansen &Lunde (2004b), we went a further step by deducing a measure of variance of noise. 本文基于Hansen &Lunde(2004b) 给出的在噪声序列存在相关性假设下的一种关于RV 的无偏估计, 进一步地推导出一种在此情形下估计噪声方差的方法。
- Foreign academics find that the analysts’ forecasts of companies’ future earnings are not usually unbiased estimation, but a positive bias always added, and there is underreaction to information. 国外的研究表明分析师的预测通常不是对未来盈利的无偏估计,而是往往存在正偏差现象,并且对信息存在反应不足。