1) time-varying variance
时变方差
1.
Calculation of optimal hedge ratio of stock index futures under time-varying variance;
存在时变方差的股指期货最佳套期保值比率计算
2.
The linear prediction (LP) model with time-varying variance of the prediction error is proposed for speech signal modeling.
基于对线性预报残差的短时 (2ms～ 4ms)特性分析 ,给出了线性预报系数及线性预报误差时变方差的迭代估计方法。
2) slowly varing variances
慢时变方差
3) temporal varying weight minimum variance
时变权最小方差
1.
The temporal varying weight minimum variance combination forecast model is established taking the periodic nestification method, the stable temporal series method and the grey forecast as subforecast model.
本文介绍了组合预测模型的原理,并以周期叠加外推法、平稳时间序外推法和灰色预测为子预测模型建立时变权最小方差组合预测模型。
4) time-varying score covariance
时变主元协方差
1.
In this paper,a new statistical batch monitoring approach based on variable-wise unfolding and time-varying score covariance structures is proposed.
针对多向主元分析(MPCA)模型批过程在线监测的缺陷,提出了一种基于变量展开和主元协方差随时间变化的MPCA方法,该方法按变量展开,不需要对新批次未反应完的数据进行预估,而数据之间的动态联系通过时变主元协方差得以保存,并且不需要建模批次的长度相等;将该方法应用于青霉素补料分批发酵过程的实时监测中,结果表明该方法比传统的MPCA方法具有更可靠的监测性能。
5) 2-order time varying difference equation
二阶时变差分方程
1.
This paper presents a method to replace the practical plant characteristics using 2-order time varying difference equation with time delay for a kind of parameters unknown and high order,as well as time delay constant system.
针对一类参数未知、高阶有滞后的定常系统的控制问题,提出了在特征建模基础上,用有滞后的二阶时变差分方程来代替实际的对象特性,并给出了分析证明。
6) time-varying covariance
协方差随时间变化
补充资料：时变
1.四时季节的变化。 2.时世的变化。亦指时世变化的规律。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条