statistical variation

This paper provides a statistical study of the variation of the Atmospheric Vorticity Area Index ( VAI) during geomagnetic storms for 1966-1978. The results show that the influence of geomagnetic storms on VAI is very obvious.

本文分析了1966&1978年间地磁暴期间地球大气气旋的变化。在地磁暴发生后，大气涡度面积指数（VAI）出现明显的扰动。

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A Statistical Analysis of Torque and Thrust Variation of the Propeller under Random Head Wave

在随机迎浪下螺旋桨的扭矩和推力变化的统计分析

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Parameters of the dynamic statistical model are the time-varying parameters, variation of parameter reflects the variable trend of seepage.

动态模型的统计参数是随时间变化的时变参数，参数的变化反映了大坝的渗流变化趋势。

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This essay derived the estimated quantity of the model parameters and F statistical quantity of the hypothesis testing for unperfect block design by using parameter estimation and variation analysis of linear model. So it helps to get further conclusion of block design and factorial analysis.

用线型模型的参数估计与方差分析知识，对全套重复的不完全区组设计问题进行分析，找出了模型参数的估计量，并给出了假设检验的F统计量。

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Methods Field survey, the Delphi method, questionnaire survey, analysis of variation , and Statistical Analysis System ( SAS ) were employed.

方法　现场调查 、 德尔菲专家咨询 、 问卷调查 、 方差分析、 SAS 统计分析等方法被采用.

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