一、 估计式中有时间趋势项(time trend)及常数项(drift term): 其假设为: 1 : 1 : 1 0< = γ γ H H 21 t p t p t t e Y Y Y Y t a a y + ∆ + + ∆ + ∆ + + + = + − ...
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有一项web设计趋势已经流行一段时间了，但似乎势头依然不减，这便是使用大背景图像。
A trend in web design that has been popular for a while, and still seems to be gaining momentum, is the use of big background images.
介绍了高次差法求解时间序列中趋势项的基本原理与方法。
The paper introduces the principle and method of resolving time-series tendency part with higher difference method.
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。
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).
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