上海世博会经济贡献率的灰色预测模型

o predict the economic contribution rate of the Shanghai World Expo,the possibility of the application of grey forecasting model is discussed.It Briefly introduces the establishment of grey forecasting model and method of testing the precision of the model and applicats the theory in the prediction of the economic contribution rate .Scince the economic contribution rate is time series data, GM ( 1, 1 ) prediction model of time series can be provided with the help of the test and residual error amendment. Finally a MATLAB program for grey forecasting is prepared. The result that Shanghai 's economic contribution rate is highest in July, lowest in March, April and August , and ranks middle in May and June , is consistent with actual situation.Research shows that grey forecasting model is simple and of high precision in forecasting the Economic contribution rate.