查询词典 variance

Furthermore, how to apply the model efficiently in practice is deeply discussed. As the variance produced by the forecasting model as concerned, the real-time revised method of hydrological forecasting is highlighted. Next arranged, the multi-stratum recursive prediction model is put forward to forecast the error series that is a dynamic system. Later, an error selfregressive multi-stratum recursive prediction model is set up as well as a current algorithm offered. Finally, the difference collated model and the gloss control method, which are devoted to updating the mid-long term hydrological forecasting during the meditate period, are put forward.

在综合评述中长期水文预报现有方法和模型的基础上，采用时间序列分析方法，建立中长期水文预报的时间序列组合模型，并对模型如何在实际中有效应用作了较为深入的探讨；针对模型预报所产生的误差，又重点研究了水文预报实时修正方法：提出了采用多层递阶预报方法对误差序列这一动态系统进行预报，建立了误差自回归多层递阶预报模型，并提出了较为通用的解算方法；给出了水文中长期预报中期修正的残差相关模型和总量控制方法。

This research was divided into four hypotheses and used descriptive statistics, reliability analysis, correlation analysis, independent-samples T Test, analysis of variance and multiple analysis regression as statistic methods.

本研究分四个假设，使用统计方法有描述性统计分析、信度分析、相关分析、独立样本t检定、变异数分析、多层级回归分析。

analysis of variance, regression, statistic, expected value

当然，现存统计软件掂来即是，比如Mathematic、Statistic等都是很好的数据处理软件，即使Excel本身，除有各种数据处理函数外，还提供了专门的"数据分析"工具包，但这些软件一方面对学生较陌生，另一方面在课堂上直接使用未

The advantages and limitations of every kind of methods for calculating the failure probability is reviewed. The frist order reliability method, the second order reliability method and many kinds of boundary method have achieved remarkable success and formed nature fields of reliability. However, the precision of these methods decrease as the increase of complexity of problem. The numrical methods are versatile, except numerical intergration is only adaptable to special problems which have small number variables and regular intergral domain. Particularly, the advanced variance reduction techniques own the following character: high precision and a small amount computation. But some questions remain to study in the future because only an initial work about these techniqes is developed.

全面评述了计算失效概率各种方法的优点和局限性，其中经典的解析法包括一次可靠性方法、二次可靠性方法、一阶边界法、Vanmarcke上边界、PENT上边界和Ditlevsen二阶窄边界法，这些方法对于多设计点、变量较多且相关、密度函数不是正态以及极限状态方程较复杂的情况，其计算精度较差；而已有的数值方法却是具有较好的通用性，其中除数值积分法只对变量较少、积分域较规则的特殊问题适用外，各种数值模拟方法均具有较广的适应性，特别是各种改进的方差减小技术，精度高、计算量小，但由于其处在研究的初级阶段，还有许多问题有待于解决。

Deficient degree; and the other is the evaluation model based on the variance of relative deficient degree.

和模型不但是有意义的，而且在计算上也是可行的。

This paper analyzes spatio-temporal variance of features in urban relief map, and proposed design principle, method and steps to construct spatio-temporal database of urban relief map.

在现有基态修正模型的基础上提出了多基态多级差文件修正方法和多基态两级差文件修正方法。

Beside, the writer of the article believes that Hu Shi's literary revolution actually bias some relique of "the revolution of poetic world" arid is seemingly in harmony but actually at variance with Revival of Learning.

此外，胡适的文学革命实际上仍然有"诗界革命"的遗风，而与"文艺复兴"貌合神离。

Taking a copper mine as an example,based on geostatistics theory and method,a mathematic model and an entity engineering model have been established by using mining software,with some variance function representing regionalized variable characteristics.

以某铜矿为例，基于地质统计学理论和方法，应用能够反映区域化变量特征的变异函数，利用矿业软件，建立了矿山矿床的数学模型和工程实体模型。

The numerical results show that outer scale of turbulence has great effect on G-tilt power spectrum and residual variance of tilted tracking at low frequency but almost has no effect on the high frequency.

数值计算结果表明大气湍流外尺度对G倾斜功率谱以及倾斜跟踪残余误差的低频段影响较大，而对高频段的影响可以忽略不计。

The G-tilt power spectrum and the residual variance of tilted tracking as functions of the outer scale of turbulence are deduced theoretically.

详细推导了G倾斜功率谱以及倾斜跟踪残差与大气湍流外尺度的函数关系式。

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。