Discussion of the Problem of Grey Forecast Model
灰色预测模型的问题讨论

In accordance with analysis of various examples, this paper points out that so far as same primitive sequence is concerned, forecasting value of GM(1,1) enlarges when the calculating null point rises, and the second term of the new sequence decreases, and cumulative number increases. It is pointed out at the same time that these problems depend on the character of GM(1,1) itself.