北京交通大学论坛-知行信息交流平台

 找回密码
 注册

微信登录

微信扫一扫,快速登录

快速进入版块与发帖 搜索
分享 Normal distribution(4)
study 2011-1-20 07:20
History Development Some authors attribute the credit for the discovery of the normal distribution to de Moivre , who in 1738 published in the second edition of his “ The Doctrine of Chances ” the study of the coefficients in the binomial expansio ...
个人分类: Math|429 次阅读|0 个评论
分享 Normal distribution(3)
study 2011-1-20 07:18
Normality tests Main article: Normality tests Normality tests assess the likelihood that the given data set { x 1, …, x n } comes from a normal distribution. Typically the null hypothesis H 0 is that the observations are distributed normally with unspecified mean μ and varian ...
个人分类: Math|314 次阅读|0 个评论
分享 Normal distribution(2)
study 2011-1-20 07:17
Properties Standardizing normal random variables As a consequence of property 1, it is possible to relate all normal random variables to the standard normal. For example if X is normal with mean μ and variance σ 2, then has mean zero and unit variance, that is Z has the sta ...
个人分类: Math|382 次阅读|0 个评论
分享 Normal distribution(1)
study 2011-1-20 07:14
From Wikipedia, the free encyclopedia (Redirected from Gaussian distribution ) Jump to: navigation , search This article is about the univariate normal distribution. For normally distributed vectors, see Multivariate normal distribution . Probabi ...
个人分类: Math|382 次阅读|0 个评论
分享 csgn(a) Re(a) Im(a)
study 2011-1-20 06:48
复数 a 可以写成 u + v i的形式, u 为复数a的实部,简记为 u = Re(a) v 为复数a的虚部,简记为 v = Im(a) 例如,已知复数z = 1+2 i , 则 Re(z) = 1 Im(z) = 2 因此一个复数z 也可以写成 z = Re(z) + Im(z) i ---------------------- 我再说几句, (1) Re( ), Im( )可以视为复变函数 , 函数的自变量是 ...
个人分类: Math|399 次阅读|0 个评论

手机版|北京交通大学论坛-知行信息交流平台 ( BJTUICP备13011901号 )  

GMT+8, 2022-1-23 17:07

Powered by Discuz! X3.4

Copyright © 2001-2020, Tencent Cloud.

返回顶部