时间序列灰色模型（gm,rgm,vgm,agm).zip_VGM_mendpp_rgm_灰色模型

# Time-Series-Prediction-based-on-grey-system-theory 1.calculate predict value by using 4 types of grey model, gm(1,1),rgm(1,1),vgm(1,1) and agm(1,1) 2.calculate mse to make comparison 3.make forecasting for future value 4.display result in the graph