Using the same sample data just discussed above, the following illustrates the difference in cardinality estimates with and without the use of statistical view for the query. 下面使用以上讨论的相同的示例数据,阐释在使用和不使用查询的统计视图的情况下基数估计的差别。
Sometimes called random samples, probability samples allow statistical inferences about the accuracy of sample estimates. 概率抽样用统计学的推断来说明样本的准确性。
Regional flood frequency analysis is a useful approach method that avoids the shortness of at-site sample series and estimates design flood for un-gauged area. 区域频率分析能充分利用相似流域组的资料来扩充信息量,克服单站样本系列资料短缺的局限,解决无资料地区设计洪水的估算问题。
Sample Survey Method in Sensitive Questions and Mean Square Errors of Estimates 敏感性问题中的抽样调查方法与均方误差
TESTING Sample Size Estimates for the Experiments of Fruit Trees 果树试验中的样本容量估计
Under these conditions, the strong convergence of sample estimates of the fourth-order moment and cumulant is established, and the convergence rate is obtained. 在这些遍历条件下,建立了四阶矩和四阶累量样本估计的强收敛性,并得到了强收敛速度。
Conclusion Sample size calculated by formula will assure that the investigator understand accurately the degree of point estimates of VE close to the true value of VE in the population. 结论使研究者能较为准确地掌握VE点估计值接近总体真实值的程度。
This paper deals with a method for evaluation of precision of engineering geological data, including data optimization, determining optimum sample volue, and reliability of calculation. The target value estimates and their confidence levels are given for different design stages. 本文探讨了工程地质参数精度评价的方法,其中包括数据优选,确定最优样本容量及计算可靠度,按不同设计阶段给定的目标值评价其置信水平。
Second, using the sample from above, this paper estimates the parameters of CIR model by the 本文的创新之处有:(1)国内对利率模型的研究主要集中在模型参数的估计上,而对利率模型的应用研究较少,本文尝试把利率模型
Some Exact Finite Sample Properties of Zellner's Seemingly Unrelated Regression Equations Estimates SUR回归系统部分方程系数Zellner估计的有限样本性质
This result indicates that the appropriate sample size will be necessary for QTL mapping in low QTL heritability to improve the precision of estimates of QTL position and effects. 因此,在QTL遗传力较低时,为了提高QTL位置和效应估计的准确度与精确度,适当的样本容量是必要的。
Firstly, the overall sample is estimated. Secondly, this paper respectively estimates two groups of sub-industries, which are divided according to whether the FDI enterprises of each sub-industry are export-oriented or not. 实证分析基于非平衡面板数据,首先对总体样本进行估计,接着按照各子行业中的外商直接投资企业是否为出口导向型,把子行业分为两类进行分组估计。
To obtain a reasonable length of the sample, this paper calculates the least length of the sample for assessing the typical load conditions of excavators, using the method of approximate mean value estimates, based on the theory of hypothesis testing. 2. 为获取合理长度的数据样本,本文依据假设检验的思想,运用近似均值估计法确定出制定挖掘机典型负载工况所需的最小样本长度。
Based on complete sample, this thesis estimates the mean life of Weibull distribution. 本文在完全样本情形下,对威布尔分布的平均寿命进行了评估。
When the sample size is fixed, along with the increasing of the missing proportion, the standard errors of the parameter estimates under these three model identification restrictions become larger and larger. 在样本含量一定的条件下,随着缺失比例的增大,三种识别限制策略参数估计结果的标准误越来越大。
Using assumed explained variable condition, applying the maximum entropy principle and with the condition probability distribution complying with that of sample data and prior distribution, the author finally estimates an optimal conditional probability density of the LGD. 利用假定的解释变量条件,应用最大熵原理,并要求所估计的条件概率分布一致于样本数据和先验分布,最终对违约损失率估计出最佳的条件概率密度。
Reason for the difference is that the method exists in the sample if the human factor, it will reduce the accuracy of the results of new arable land estimates. 差异的原因在于该方法如果在抽样时存在人为因素,就会降低新增耕地测算结果的精度。