正态分布(Normal distribution)又名高斯分布(Gaussian distribution),是一个在数学、物理及工程等领域都非常重要的概率分布,在统计学的许多方面有着重大的影响力。若随机变量X服从一个数学期望为μ、方差为σ^2的高斯分布,记为N(μ,σ^2)。其概率密度函数为正态分布的期望值μ决定了其位置,其标准差σ决定了分布的幅度。因其曲线呈钟形,因此人们又经常称之为钟形曲线。我们通常所说的标准正态分布是μ = 0,σ = 1的正态分布。
一.t分布(t-distribution)(一)u分布在前一章中,我们已经讲述了正态分布(normal distribution)是数理统计中的一重重要的理论分布,是许多统计方法的理论基础。正态分布有两个参数,μ和σ,决定了正态分布的位置和形态。
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...极限定理 正态分布 弹道轨迹 [gap=666]Keywords : gaussian distribution;gauss random;center limit theory;normal school;ballistic trajectory ...
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对数正态分布 log-normal distribution ; [数] Logarithmic normal distribution ; normal logarithmic distribution
非正态分布 [数] abnormal distribution ; non-normal distribution ; abnormal distrbution
标准正态分布 [数] Standard normal distribution ; standardized normal distribution ; standard statistics normal distribution
矩阵正态分布 matrix normal distribution
双变量正态分布 Bivariate normal distribution
正态分布曲线 normal distribution curve ; [数] normal curve of distribution ; Normal Curve
污染正态分布 Contaminated normal distribution
产生正态分布随机数 randn
二元正态分布 [数] bivariate normal distribution ; two dimensional normal distribution
Moreover we discuss the economic meanings of the model and extend the model to normal distribution.
本文进而对模型的经济含义进行了探讨,并在正态分布下进行了推广。
参考来源 - 基于价值无差异的资产定价模型Non-parameter test are used to data with no normal distribution.
个别不符合正态分布数据则采用非参数检验。 两组间的均数比较采用配对T检验。
参考来源 - 运用中医肝主疏泄理论治疗卒中后抑郁症的研究A color sampling module similar to the normal school, used for calculating the threshold of different color is presented in the process of sampling, which makes a good experiment result.
在采样过程中提出了一种基于近似正态分布的颜色采样模型计算各颜色阈值,取得了良好的实验效果。
参考来源 - 全自主足球机器人视觉系统设计At last, use the Hyperbola method to predict the Ultimate bearing capacity of single pile and compare with the prognosticate results which by Grey method, the predicated results obey the Gaussian distribution and meet the demand of the project.
最后,采用双曲线法对挤扩支盘桩竖向极限承载力进行了预测,同灰色预测结果相比,二者在分布上相接近,均服从正态分布,且预测值满足工程需要。
参考来源 - 基于灰色系统理论的挤扩支盘桩单桩竖向极限承载力预测应用研究Based on the data of average temperature and precipitation of 129 stations of China from 1961 to 2000, this paper uses normal school and Γ distributing simulating probability distributing of average temperature and precipitation separately.
本文利用1961-2000年中国129站日平均气温和日降水量资料,用正态分布和Γ分布分别模拟了各季日平均气温和夏季雨日降水量的概率分布。
参考来源 - 中国近40年气温和降水的概率分布及年代际差异Somecreative theories and relevant algorithms will be put forward such as first layer gridauto-selection algorithm based on normal distribute, multi-layers rotate coding,single-layer grid files, in-out-block algorithm to improve the performance of query.
针对二者的优缺点,本文提出了的基于正态分布的第一层网格长、宽自动调配、多层螺旋式索引块编码、单层网格空间索引技术、利用内外块提高查询效率等有创造性的理论和相关算法。
参考来源 - 改进的层次网格空间索引技术研究与实现·2,447,543篇论文数据,部分数据来源于NoteExpress
由于数据集不是对称的,我们可以清楚地排除正态分布模型不是一个合适的选择。
As the dataset is not in a symmetrical shape, we can clearly rule out that a normal distribution model would not be a suitable choice.
上面的例子使用了正态分布。
股价大幅波动,例如股市崩溃,比正态分布预料的要常见。
Large movements in prices such as crashes are much more common than would be predicted in a normal distribution.
This is the most famous bell-shaped curve, but there are other ones with different mathematics.
正态分布是最著名的钟形曲线,但仍有其他表达式下的钟形曲线
To actually apply this it helps to go to something called the normal approximation to the binomial, because it's kind of difficult to compute this formula.
在实际应用这些公式的时候,需要运用二项分布的正态近似定理,因为二项分布公式的值很难计算
It could be normal, everything, that would be a Gaussian, where if you recall there was a mean, and a standard deviation, and most values were going to be close to the mean.
可能是正态分布,也就是高斯分布,只要有平均值和标准偏差值,你就可以进行调用,大部分的值都是集中在平均值附近的。
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