查询词典 unbiased sample

Describes general methods of point and interval parameter estimation and the small and large sample properties of estimators: method of moments, maximum likelihood, unbiased estimation, Rao-Blackwell and Lehmann-Scheffe theorems, information inequality, asymptotic relative efficiency of estimators.

点估计和区间估计的一般方法，估计量的小样本和大样本性质：矩法，极大似然估计，无偏估计，Rao-Blackwell 和 Lehmann-Scheffe 理论，信息不等式，渐进相对有效估计量。

We discuss asymptotically best linear unbiased estimators of the Logistic population based on selected order statistics and give the formula of computing the ABLUE, the variance and the covariance of the ABLUE in limit, and properties of the ABLUE, and so on. We give the optimum chosen of spacing which is the ABLUE with maximum asymptotic relative efficiency based on complete sample when selected order statistics number is less than 10, and obtain its maximum asymptotic relative efficiency.

讨论基于Logistic总体Ⅱ型截尾样本的若干个样本分位数的总体分布参数的近似最佳线性无偏估计；给出了该近似最佳线性无偏估计的计算公式，估计方差与协方差的极限表达式及估计量的大样本性质等；给出了全样本，样本分位点个数固定，但不超过10情形下，使上述近似最佳线性无偏估计有最大相对联合估计效率时，样本分位数选取法及最大相对联合估计效率；为大样本情形下，该近似最佳线性无偏估计的应用提供了理论依据。

This article estimates the extreme loss distribution with extreme value theory, estimates the shape parameter with HKKP estimator, which is unbiased to small sample data, selects the right threshold by selecting smallest mean square error of the estimated cumulative distribution function and empirical cumulative distribution function and based on the extreme value theory method, this article estimates the extreme loss distribution and the p-percentile operational loss under certain believe range for Chinese commercial banks, then calculates the operational risk supervise capital.

本文利用极值理论对中国商业银行操作损失极端值分布进行估计，针对尾参数估计的来用传统Hill佑计对小样本数据容易产生偏倚的情况，提出了采用Hill佑计的改进―小样本无偏估计的HKKP佑计来估计操作损失的尾参数，针对由于阈值确定不准确导致结果偏差大的情况，采用最小化估计的累计概率分布与经验累计概率分布平均平方误差的方法确定较精确的阈值，估计出给定置信水平下操作风险损失的分位数，从而使得中国商业银行操作风险监管资本的测定成为可能。

Then the best linear unbiased estimate method for interval data of normal distribution, Weibull distribution, extreme value distribution or other location-scale parameter models is presented. The presented method has higher precision, and solves the problem of reliability assessment with small sample of storage life.

在此基础上，提出一种区间数据最佳线性无偏估计方法，并对正态分布、极值分布、Weibull分布等常用的位置一尺度分布进行讨论，该方法能够对产品贮存寿命进行小样本预测和可靠性评定。

Care should be taken to obtain an unbiased sample.

要取得一个真实无误的样本，须应仔细从事。

Here we report Li abundances for an unbiased sample of solar-analogue stars with and without detected planets.

我们的报告中有关锂丰度的样本真实可靠，样本中既含有"有行星"恒星同时具有"无行星"恒星。

The only way to obtain a true and unbiased sample of interstellar dust particles is to go to where they are– in space– and collect them there.

获得一个真实没有偏差的星际尘埃样本的唯一方法就是到太空去收集。

With a pristine and unbiased sample of interstellar dust they can truly find out if and by how much the elements of our own world differ from others throughout the galaxy.

通过这些原始的无偏见的星际尘埃样品，人们能真正找出究竟我们的太阳系同银河中的其它星球是否有元素差异以及相差多少。

Specific applications include de novo sequencing and re-sequencing of genomes, metagenomics, RNA analysis, and targeted sequencing of DNA regions of interest. The hallmarks of 454 Sequencing? are its simple, unbiased sample preparation and long, highly accurate sequence reads, including paired reads.

具体的应用包括基因组的从头测序和重测序、宏基因组学、RNA分析和DNA目标区域的定向测序。454测序系统的特点是样品制备简单且无偏向性，读长超长且准确度高。454测序系统的技术已经催生了各个研究领域的几百项经同行评议的研究文章，例如癌症和传染病研究、药物筛选、海洋生物学、人类学、古生物学等各方面研究。

Here we report Li abundances for an unbiased sample of solar-analogue stars with and without detected planets.

我们的报告中有关锂丰度的样本真实可靠，样本中既含有&有行星&恒星同时具有&无行星&恒星。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。