摘要
最小二乘法是最小无偏估计,在水文上常被用来推求单位线.但是在法方程系数阵处于病态或者观测值中含有粗差的情况下,采用最小二乘法估计的误差会很大甚至出现不合理的估计.针对这一情况,采用目前在测绘上应用较广的抗差岭估计进行单位线的推算,效果较为理想.
The least squares estimation is a roinimum and unbiased estimator and it is often used to estimate the unit hydrograph in hydrology. However, the results of least squares estimator are not satisfactory or even unreasonable when the matrix ATA is ill-conditioned or there is outlier in the observed data. Robustified ridge estimation which has been widely used in surveying and mapping is suggested to solve these problems and is applied to the estimation of unit hydrograph with satisfactory results.
出处
《浙江水利水电专科学校学报》
2006年第3期9-12,共4页
Journal of Zhejiang Water Conservancy and Hydropower College
