摘要
对现行P-Ⅲ型频率曲线参数估计方法所产生的误差进行了分析,针对端矩误差是参数估计的主要矛盾,提出了新的数值计算的开型积分方法,并对大量理想系列和一部分实测水文系列进行对比检验表明,通过提高开型积分的精度从而全面提高了三参数的估计有效性,解决了现行方法中对均值估计精度低的问题。新的数值计算的开型积分方法简单易行,具有良好的实用性及推广价值。
In this paper, the estimated error of parameters for Pearson Type Ⅲ distribution is analyzed and new open integration formulas are put forwarded in accordance with end moment being main error source. The testing for synthetic idea sequence and observation data shows that these methods have improved estimation accuracy of three parameters and have solved the problem of mean underrating. The new integration formulas have the features of convenient, good application.
出处
《水文》
CSCD
北大核心
2004年第6期17-22,共6页
Journal of China Hydrology
关键词
P-Ⅲ型分布
参数估计
开型积分
Pearson Type Ⅲ distribution: estimation of parameters: open integration formula
