UNBIASED ESTIMATION OF EXTENDED GREY MODEL AND ITS APPLICATION TO FORECAST OF DEFORMATION OF STEEP SLOPES
Liu Zhiping ;and He Xiufeng
Hohai University, Institute of Satellite Navigation & Spatial Information System, Nanjing 210098
Abstract An unbiased estimation method based on original series and accumulated series for extended grey model (EGM) is developed, and the formula is proposed for calculating maximum predictable time scale of grey model. Unbiased extended GM (UEGM) has the characteristics of numerical stability, modeling objectivity and unbiased property. The steep slope engineering of Xiaowan Hydropower Station is studied as a case. The results show that the UEGM (1, M) model is better than the UGM (1, 1) and the EGM (1, M) models in precision and reliability.\
Key words ：
grey model(GM)
unbiased extended
accumulated generating operation
steep slope
deformation prediction
Received: 01 January 1900
Corresponding Authors:
Liu Zhiping
Cite this article:
Liu Zhiping,and He Xiufeng. UNBIASED ESTIMATION OF EXTENDED GREY MODEL AND ITS APPLICATION TO FORECAST OF DEFORMATION OF STEEP SLOPES[J]. , 2008, 28(1): 41-44.
Liu Zhiping,and He Xiufeng. UNBIASED ESTIMATION OF EXTENDED GREY MODEL AND ITS APPLICATION TO FORECAST OF DEFORMATION OF STEEP SLOPES[J]. jgg, 2008, 28(1): 41-44.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2008/V28/I1/41
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