查询词典 t distribution

In addition, there will be bimodal distribution for time series if there is a linear trend, but it doesn't change the probability distribution of differences of scalars.

同时，也发现，线性趋势的存在会使原变量的概率分布出现双峰，但是不会影响变量差的概率分布。

Especially,when there are local changes among the data,and a single parametric distribution family can\'t describe the observed data accurately,finite mixing distribution models usually make excellent performance.

特别是，当观测数据有局部变化，而单一的参数分布族无法确切地描述观测数据时，有限混合分布模型表现出色。

Since financial asset returns don't often follow the hypothesis of normal distribution, we try to evaluate VaR by mixture of normal distribution and extreme value theory. The purpose of my study uses various Value at Risk models for monitoring the market risk of foreign investment port folio.

本研究主要目的在比较何种方法在估计汇率波动风险值时较具准确性，希望能够提供一客观风险揭露的参考工具，让必须面临汇率风险的企业及金融机构能有效判断目前的风险程度，以采取必要之避险措施。

If you think of normal distribution, the tail of the distribution, no matter what it is you don't want that.

如果你想到正态分布，分布的末端，不管你不想要的是什么。

This method makes full use of the structural features of the reliable distribution network, optimizes the numbered branches, nodes and loads, uses directly branch impendance parameter to calculate, and doesn't need formming bus admittance matrix and converting triangular matrix. Simple dealing with algebra equations can calculate node voltage and power distribution, which makes the program more efficient and exact.

该方法充分利用辐射配电网络的结构特点，对分支、节点和支路编号进行优化，它直接采用支路阻抗参数进行计算，不需要形成节点导纳矩阵和进行三角矩阵变换，简单的处理代数方程就可以计算节点电压和功率分布，使得程序实现起来更加高效、准确。

In order to determine organic storage and its space distribution characteristics in paddy field of region, on the basis of second soil survey database, the space databases in unit of soil local type were set up by adoption Arcview software, integrated with GIS software, basined on soil type methods and region scale, the distribution of soil organic carbon storages in purple paddy soil of Chongqing were investigated. The results showed that the storage of SOC in Banan district of Chongqing was 6.48×10^6 t and average SOC density in Banan district with 8.31 kg/m^2 was higher than that of China.

为了明确区域稻田土壤碳库蓄积量及其空间分布特征，以全国第二次土壤普查数据资料为基础，运用地理信息系统软件Arcview建立研究区以土种为单位的空间数据库，结合GIS空间分析功能，基于土壤类型法估算重庆市巴南区稻田土壤有机碳储量及其空间分布特征，结果表明：研究区稻田土壤有机碳总储量约为6.48×10^6t，平均土壤有机碳密度为8.31kg/平方公尺，略高于全国平均水平。

In the rice leaves infected by RDV Yunnan isolate, the distribution of cells full of virus particles formed a belt which was a center of infection and multiplication of virus, around the cells fall of virus particles were some cells with the different extent of lesion as follows: disappearance of membrane system of chloroplasts, there were virus particles in some chloroplasts, and some sine or assembled virions in the mitochodria or cytoplasma but not in nuclei ,and intact subcellular structure in the cell far away from the infected center; In the rice leaves cell infected by Zhejiang isolate, some cells were full of virions, but the distribution of cells didn't form the belt, other cytopathological characters were similar to the cells infected by Yunnan isolate.

RDV云南分离株浸染的水稻叶片中，充满病毒粒体的细胞呈条带状分布，呈现出明显的侵染和增殖中心，在充满病毒粒体的细胞周围，相邻细胞有不同程度的病变，叶绿体膜系统消失，部分叶绿体中含有病毒颖粒，线粒体残体及细胞质中有分散或聚集的病毒粒体，细胞核中未见病毒粒体，离侵染中心较远的细胞中亚细胞结构较完整；RDV浙江分离株侵染的水稻叶片中，部分细胞充满病毒粒体，无明显的条带状分布，其他细胞病理特征与RDV云南分离株侵染的水稻叶片相似。

The fourth part, through an analysis of human resources state of the Northeast, we think the human resources of the Northeast have the following several subject problems: The teenage labor population is too big in specific gravity, unfavorable to the sustainable development of economy; Human resources in urban and rural areas to distribute unbalanced, countryside of the right age to overpopulate , can't meet demands of urban economy development , form the labor force of leaving unused at the same time , cause the waste of the human resources ; Human resources industry distribution is unreasonable, the Northeast human resources distribution between the industry of human resources concentrates on primary industry mainly, proportion is too big, and the labor productivity of primary industry is relatively low, do not have enough ability to make the human resources shift to the secondary and tertiary industries, so seem the secondary and tertiary industries to be delayed effect enough.

第四部分，通过对东北地区人力资源状况的分析，我们认为东北地区人力资源存在以下几个主要问题：未成年劳动人口比重过大，不利于经济的可持续发展；人力资源城乡分布不均衡，农村中适龄劳动人口过多，不能满足城市经济发展的需要，同时形成闲置劳动力，造成人力资源的浪费；人力资源产业分布不合理，东北地区人力资源在产业间的分布主要集中在第一产业，比重过大，而且第一产业劳动生产率较低，没有足够的能力使人力资源向第二、三产业转移，因此显得第二、三产业后劲不足。

Vertical distribution of avifunna shows the percentage of Palaearctic realm species, Oriental realm epidemic, epidemic species and most of distribution patterns don't always incresing or decresing with the elevation, but changes as waving style.

垂直区系分析发现：随海拔高度的增加，古北界、东洋界、广布种的比例并不是呈规律性的增加或减少，而是波浪式的变化；绝大多数分布型的比例也呈波浪式的变化。

The partly cold-adaptation stratagem of the high altitude amphibian tadpole were researched in the laboratory by analyzing the high altitude amphibian tadpole of Scutiger boulengeri mainly on endpoints related to the dynamic variation of the micro-spatial behavior distribution patterns, the experiment of the temperature tolerance, and the enzyme content and activity of the lactic acid dehydrogenase isozyme in special temperature condition.The behavior distribution of the Scutiger boulengeri t...

西藏齿突蟾蝌蚪在不同温度的行为分布是一连续、动态过程，需用多种检验方法综合利用才能进行判断；在15℃，除低海拔分布的西藏齿突蟾种群外所有实验物种蝌蚪均符合负二项分布、NeymanⅡ型分布；在10℃，高海拔两栖类蝌蚪均符合负二项分布、NeymanⅡ型分布；在5℃、0℃低温时，高海拔两栖类不同分组的西藏齿突蟾蝌蚪的负二项分布、NeymanⅡ型分布均呈现明显差异，这可能与高海拔两栖类蝌蚪在低温条件下通过不断地改变其行为分布方式来避免自身被冻伤有关。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。