查询词典 analysis of time series

A model for finding the cryptic period of hydrological time series is proposed. The functions of the model include to apply logarithm transformation for making the sequence more stationary, to construct a corresponding auto-regression model for reducing the herteroskedasticity of residual, to determine the component of the prime period by periodogram analysis.

本文在讨论水文时序平稳性和异方差性的基础上，提出了检测水文时序隐含周期的模型，即对水文时序设计对数变换序列，提高序列的平稳性；建立相应的自回归模型降低残差的异方差性；通过对所得平稳序列进行周期图分析确定可能的主周期分量。

Model for finding the cryptic period of hydrological time series is proposed. The functions of the model include to apply logarithm transformation for making the sequence more stationary, to construct a corresponding auto-regression model for reducing the herteroskedasticity of residual, to determine the component of the prime period by periodogram analysis.

bstract 本文在讨论水文时序平稳性和异方差性的基础上，提出了检测水文时序隐含周期的模型，即对水文时序设计对数变换序列，提高序列的平稳性；建立相应的自回归模型降低残差的异方差性；通过对所得平稳序列进行周期图分析确定可能的主周期分量。

Theoretical analysis and experimental results demonstrate that some well known piecewise linear representation methods are special situations of proposed method. 2 A systemic method of indexing and similarity based querying in time series databases based on Piecewise Polynomial representation is proposed.

这项研究还从理论上证明了分段多项式表示是一种理想的时间序列高级数据表示形式，而著名的分段直线表示法和分段合计表示法只是PPR的特例。

The principal component time series of rotated EOF were used to classify the distributions of ozone concentrations into 15 patterns by cluster analysis.

本研究中并将REOF的主成分时间序列以群集分析的华德法分为十五个类组，以探讨臭氧事件日的污染型态，除了求出各种型态的臭氧特性外，还建立转换表，得到臭氧型态在连续两日转换的机率，由此表可以看出臭氧型态具有相当高的持续性。

The EOF loadings corresponding to the five highest eigenvalues were used to delineate the air quality regions. The results of EOF method were difficult to interpret because they tend to cluster most stations into the first group. The results obtained by rotated EOF and cluster analysis are similar and more reasonable. It is interesting to note that the clustering results based on 1h and 8h data are similar. The principal component time series of EOF and REOF were analyzed to determine their temporal characteristics.

EOF和REOF法中均采用特徵值为最大的五个EOF负荷作为分区的依据，以EOF划分均质区后容易将大部份测站划为同一区而造成解释困难，而采用REOF方法和群集分析法所得结果相似且较为合理，利用最大小时与八小时臭氧浓度进行划分结果接近，本研究也针对EOF和REOF所求出的主成分时间序列加以分析，以了解其特性。

The composite scattering between dielectric sea surface and a conducting plate above it is calculated by using Physical Optical method and reciprocity theorem. Meanwhile, the dependence of the plate size on the composite scattering field is considered. The Doppler spectrum and the chaotic characteristic for the time series of composite scattering field are analyzed. Finally, artificial neural networks and wavelet analysis are introduced into the study of the sea clutter to realize the purpose of target detection, the factors which affect the detection of the target are discussed and the solutions to these problems are given.

同时利用物理光学近似结合互异性原理计算了介质粗糙海面与其上方导体运动平板的复合散射，考虑了平板尺寸对复合散射场的影响，并对复合散射场时间序列进行了多普勒谱分析和混沌分析，最后将人工神经网络和小波分析引入到海杂波的分析当中，实现了海杂波中目标探测的功能并讨论了影响目标探测功能的因素以及解决这类问题的方法。

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。

First of all, we test the stationary of the time series with the Dickey-Fuller's unit roots and D.W. tests. Secondly, we examine thecointegration of the long-run demand for money in China. Thirdly, we construct the error-correction model of the demand for money with M1 and GNP data by means of Grange analysis methods. Finally, we incorporate more factors to construct the cointegration model of the demand for money.

首先，我们运用DW初步判断法及Dickey-Fuller单位根检验检验了相关时间序列的平稳性；其次，运用协整分析中国的货币长期需求，并运用M1与GNP数据建立货币需求的误差自修正模式；最后，我们还将分析包括更多因素的货币需求协整模式。

Firstly, Flow patterns which related with the characteristics of measurement have been studied with both the time series analysis and density wave theory, which lay a solid foundation for oilAvater two-phase flow measurement Then a theoretic model of oil/water two-phase flow measurement based on stationary density wave theory has been brought up.

论文首先研究了与测量特性有关的油水两相流流型问题，基于时间序列分析和密度波理论分别得到了流型表征结论，为进一步从测量的时间序列波动信号辨识流型奠定了方法基础。

The relationship of the stock price and the performance of the listed companies and some of the related problems are studied in this paper, using the method the time series analysis by selecting ROE and EPS as the indices of the performance of the listed companies, while the SHSE composite index and SZSE Comp. Subindex as the proxies of the stock price.

选取净资产收益率和每股收益指标代表上市公司的业绩，上海综合指数和深圳成份指数作为股票价格表征，运用时间序列分析方法，在对各序列特征进行全面分析的基础上，重点对股票价格与上市公司业绩两者之间的变动关系进行了研究。

I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援，我们正徵召国家所有各种的力量：我们的外交及发展，我们的经济力量与道德劝说，所以你们与其他军人不须要孤独地负起国家安全的责任。