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正态分布根方差的估计及其应用 被引量:2
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作者 胡宏昌 占天异 《湖北师范学院学报(自然科学版)》 2011年第4期6-9,共4页
用四分位极差的方法估计正态分布的根方差,研究了子样四分位极差及根方差估计的密度函数,并结合实例,说明了四分位极差估计具有稳健性.
关键词 根方差估计 四分位极差 密度函数 稳健性
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正态分布中方差的稳健检验
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作者 胡宏昌 李检 《大学数学》 2023年第2期84-87,共4页
对子样四分位极差和正态分布根方差估计量的密度函数进行了修正;通过模拟产生随机数据,利用基于四分位极差和子样方差估计而构造的检验统计量对正态分布的方差进行检验,结果说明了前者检验方法具有稳健性,且优于后者.
关键词 稳健检验 卡方检验 四分位极差 根方差估计
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Estimating Clear Sky Solar Radiation Using Linke and Angstrom Turbidity Coefficients in Romania
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作者 E. Eftimie 《Journal of Energy and Power Engineering》 2011年第1期29-41,共13页
The renewable systems design software and building energy simulation software for energy efficient buildings, use as a main input the solar radiation. The implementation of such systems in the urban environment requir... The renewable systems design software and building energy simulation software for energy efficient buildings, use as a main input the solar radiation. The implementation of such systems in the urban environment requires accurate meteorological data for the interest area. The existence of a small number of weather stations that to offer data with regard to solar radiation as well as the limited access to these, makes necessary the conceiving of some more accurate estimation mathematical models for all climatological parameters. The present paper proposes a study of the Linke and AngstrOm turbidity coefficients, for Brasov urban area, with the purpose of a more accurate solar radiation simulation. Models performance is analyzed using the root mean square error (RMSE), the mean bias error (MBE), the mean percentage error (MPE) and the t-statistic. 展开更多
关键词 Linke turbidity AngstrOm turbidity total radiation diffuse radiation MBE MPE RMSE t-statistic.
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