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正态随机变量与Γ随机变量之比的分布 被引量:1

On the Ratio of Normal and Γ Random Variables
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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. 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 Г 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.
出处 《吉林大学学报(理学版)》 CAS CSCD 北大核心 2009年第4期649-655,共7页 Journal of Jilin University:Science Edition
基金 国家自然科学基金(批准号:J0630104) 高校博士学科点新教师项目基金(批准号:20070183023) 吉林大学基本科研经费资助项目(批准号:2008100024)
关键词 随机变量 正态分布 Γ分布 分布函数 random variable normal distribution Г distribution distribution function
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