Quartic exponential smoothing method can follow the nonlinear trend of time series better and can also forecast better.
布朗单一参数四次指数平滑能更好地跟踪时序的非线性变化趋势，达到更好的短期预测效果。
The properties, the research progress and the development trend of inorganic, organic and semi-organic nonlinear optical crystals are discussed in detail in this paper.
本文比较了无机、有机、半有机三类非线性光学晶体的性能、研究进展以及面临的主要问题和发展趋势；
As the length of mandrel extension increases, the trend of thinning-rate change can be failed into three stages, namely linear decrease stage, transitional stage and nonlinear increase stage.
随着芯棒伸出量的增加，管材弯曲过程中的壁厚变薄率变化趋势可分为三个阶段即线性下降阶段、过渡阶段和非线性增加阶段。
The varying trend of whole process can be used to reflect the varying characteristics of nonlinear spring of moving hydraulic cylinder.
关联维数的全程变化趋势可以反映液压缸运行过程中非线性弹簧的变化特征；
At last the trend of development of study on nonlinear chemistry was predicted.
最后对非线性化学研究进展趋势进行了预测。
Aiming at the two type nonlinear systems, it offers the prospects of the intelligent control development trend and puts forward the study direction.
并针对两类非线性系统，对智能控制发展趋势进行了展望，提出了研究方向。
Nonlinear and nonstationary time series are decomposed into a series of instrinsic mode functions and a residual trend item by the empirical mode decomposition (EMD).
非线性，非平稳的时间序列经过经验模分解，可以得到一组内模函数和一个基本的趋势项。
This method will gradually decompose a complex nonlinear and non-stationary signal into some stable data layers and the remaining final trend.
这种方法将一个复杂的非线性非平稳信号逐级分解成若干平稳的数据层与剩余的最终趋势项的叠加。
Linear models mainly include the factor analysis model and the trend surface model. And nonlinear models include BP neural network model.
其线性模型主要为因子分析模型和趋势面分析模型，非线性模型为BP神经网络模型。
Orthogonal polynomial approximation is proposed to estimate the nonlinear deterministic trend and then the residual is used to test the unit root.
本文研究用正交多项式逼近非线性趋势，然后对残差进行单位根检验的方法。
By nonlinear regression analysis the change law is found that with the increase of geostress the permeability coefficient will decrease with negative exponential trend.
然后通过回归分析，可以发现该地区渗透系数随地应力值的增大呈负指数递减的变化规律。
By nonlinear regression analysis the change law is found that with the increase of geostress the permeability coefficient will decrease with negative exponential trend.
然后通过回归分析，可以发现该地区渗透系数随地应力值的增大呈负指数递减的变化规律。
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