查询词典 variance

This is a globally optimized algorithm and can derive a rheological parameter estimation, showing superior statistic features including near unbiasedness of fitting residual error and almost least variance.

新算法是一个全局优化算法，所得到的流变参数估计具有拟合残差近似无偏性和方差几乎为最小的特征。

Limiting the alternatives of model by residual variance, together with parameters estimation, the correlation of the estimates matrix, the autocorrelation check of the residuals and the fitting test, can help to search for suitable model quickly and accurately.

通过残差方差定阶法缩小模型选择范围，再结合模型的参数估计、相关系数矩阵、白噪声检验和拟合优度检验最后确定模型的思路，有利于快速准确找到合适的模型。

The following conclusions have been reached, milk has an obvious absorption in the mid-infrared band, and the locations of the absorption peak are consistent with the attributes of molecule functional group analysis and the information from FOSS Company; the effects of the factors on the repeatability are below 3‰; For the quantitative analysis, the method of factorial design is applied to optimize the calibration set. The outliers are determined considering the residual variance distribution. The correlations are 0.990 and 0.986 for fat and protein, respectively. The Root Mean of Square Error of Prediction is 0.121 and 0.111 for fat and protein, respectively. With the application of the methods of wavelengths selection, the numbers of wavelength is decreased greatly from 3301 to 100. The speed is accelerated and the accuracy of the calibration is improved to some extent.

结果表明：牛奶在中红外的吸收特性明显，吸收峰的位置与分子结构的谱带归属以及乳品分析仪器的成功厂商FOSS公司提供的资料基本一致；各种因素对光谱测量影响的CV值基本可以控制在3‰以下；在定量检测中，通过析因设计方法优选校正集样品，结合样品的残差图确定奇异点，脂肪模型和蛋白模型的相关系数分别为0.990和0.986，预测均方根误差分别为0.121和0.111，而在采用波长选择对模型进行优化后，波长从3301个减为100个以内，加快了运算的速度，同时还在一定程度上提高了模型的精度。

Otherwise, Trans-Golgi complexs show the shape of flat vesicle variance and content residual.

高尔基体扁平囊形态变异，内容物的潴留。粗面内质网，腔扩张，核糖体脱颗粒。

This new algorithm can derive a rheological parameter estimation that shows superior statistic features of fitting residual error unbiasedness and least variance.

该算法不需要人工给定迭代初始值，迭代过程稳定收敛到最小点，不会陷入极小点陷阱，收敛速度很快，所得到的流变参数估计具有拟合残差无偏性和方差最小的优良统计特征。

The influence of model uncertainties is limited without debasement of fault diagnosis sensitivity by optimizing H_∞norm , fault-free residual stable variance, and H_ norm simultaneously.

针对线性不确定系统，基于自适应阈值方法，研究并提出了两种在诊断决策中抑制模型不确定性的影响来提高故障诊断系统鲁棒性的方法。

To overcome volatility clustering problems,an adaptive neuro-fuzzy inference system is combined with a nonlinear generalized autoregressive conditional heteroscedasticity model that is tuned by adaptive support vector regression so as to tackle the problem of time-varying conditional variance in residual errors.

针对传统的自适应模糊推理系统无法解决波动聚类现象，通过分析自适应模糊推理系统和非线性广义自回归条件方差的特性，提出了融合自适应模糊推理系统和非线性广义自回归条件方差的调谐模型。调谐模型实质是指在对ANFIS和NGARCH进行独立运行的基础上，对运行结果进行动态调谐操作，从而提高系统的预测精度。最后，结合实际的项目数据，证明调谐模型提高了传统ANFIS对于波动聚类现象的应对能力，获得较好的运行效果

In chapterⅡ, considering GLMMs data which the number of high units is different and the number of low units is small and unbalanced, we Conduct a series of simulations, the simulations show that regardless of the number of the level 2 units,the Bayesian estimate of random effects residual variance is more precise than PQL and the PQL estimation deviates from the true value seriously; In terms of the fixed effects estimates, When the number of level 2 units is 20, The mean and median of the Bayesian estimate is more precise than PQL,But With the number of level 2 units increase,the estimate of two methods is similar. Thus, in practical applications, we recommend the use of Bayesian method.

第二章针对不同高水平单位数，低水平数较小且不平衡的GLMMs数据，进行模拟研究，研究表明：无论水平2单位数的大小，贝叶斯方法随机效应残差方差估计值远比PQL法更接近真实值，PQL法严重偏离了真实值；而对固定效应参数估计值，当水平2单位数为20时，贝叶斯法各参数的均数和中位数均要较PQL法更接近真实值，而随着水平2单位数的增加，两种方法在估计固定效应参数时相差并不大，因而，在实际应用中，推荐采用贝叶斯法。

Criteria for model comparison were residual variance estimates, minus two log likelihood function, Akaike's information criterion, Bayesian information criterion, Bayesian factor, information-theoretic measure of model complexity, and percent relative reduction of complexity.

模型的统计标准有总剩余方差、似然函数对数值、Akaike信息尺度、贝叶斯信息准则、贝叶斯因子、模型复杂性尺度和复杂性相对下降率。

Methods: Using the time series of cucumber downy mildew disease, we established an autoregressive integrated moving average model, ARIMA(2,2,0) based on model identification, comparison of residual variance, estimation and verification of parameter, observation of the correlation of the estimates matrix, autocorrelation check of the residuals, analysis of the fitting of model and so on.

采用黄瓜霜霉病病情指数时间序列进行研究，通过模型识别、残差方差比较、参数估计及其检验、观察参数之间相关系数矩阵、白噪声检验、模型的拟合度分析等过程。

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。