J4 ›› 2009, Vol. 47 ›› Issue (4): 649-655.

• 数学 • 上一篇    下一篇

正态随机变量与Γ随机变量之比的分布

Mamudu Daffay1,2, 李涵1   

  1. 1. 吉林大学 数学研究所, 长春 130012|2.Dalcon International Company Ltd, Freetown, Sierra Leone
  • 收稿日期:2008-10-13 出版日期:2009-07-26 发布日期:2009-08-24
  • 通讯作者: 李涵 E-mail:yongyuanghappy@163.com

On the Ratio of Normal and Γ Random Variables

Mamudu Daffay1,2, LI Han1   

  1. 1. Institute of Mathematics, Jilin University, Changchun 130012, China;2.Dalcon International Company Ltd, Freetown, Sierra Leone
  • Received:2008-10-13 Online:2009-07-26 Published:2009-08-24
  • Contact: LI Han E-mail:yongyuanghappy@163.com

摘要:

针对非对称数据的拟合问题, 构造了由相互独立的正态随机变量与Γ随机变量之比|X/Y|所构成的随机变量, 利用补余误差函数的性质推导了|X/Y|的密度函数与分布函数, 并讨论了其分布特征. 结果表明, 所给出的分布具有尖峰、 细腰和右偏的特性, 能更准确地刻画数据特征.

关键词: 随机变量, 正态分布, Γ分布, 分布函数

Abstract:

For the fitting problem of asymmetric data, we constructed  the ratio |X/Y| where X and Y are mutually independent and are from the normal and Γ  random variables respectively.  We derived the PDF and CDF of  |X/Y| by the properties of complementary error function and discussed the distribution character. Our results show that the distribution
can better fit the peak, thin and rightskewed data.

Key words: random variable, normal distribution, Γ distribution, distribution function

中图分类号: 

  • O211.3