About author:WANG Shi-qing(1955-),male,native of Wuan,Hebei,a professor of North China Institute of Hydropower,engages in theory and application of statistics.
Supported by:
Supported by the NSF of Henan Province(0611052600)；
WANG Shi-qing, YANG qiao, LIU fa-gui . Two Stage Estimation and Its Covariance Matrix in Multivariate Seemingly Unrelated Regression System[J]. Chinese Quarterly Journal of Mathematics, 2006, 21(3): 397-401.
