The establishment of the model is a gradual process, which needs continuous exploration and improvement. There are two points worth noting about modeling. First, for the modeler, when the model can't explain the price behavior in a certain period of time in the past, it also has positive significance. Because this means that the model may be thoughtless, such as omitting more important influencing factors, which will help to model and improve the quality of the model. In addition, sometimes unusual price behavior may only be affected by isolated events. In this case, it may be a better method to eliminate abnormal data. The second point is worth noting that it is necessary to distinguish the difference between actual data and previous estimates. In fact, the estimated value matches the market price at that time, not the actual value. This shows that the fitting effect may be better if the actual value in the model is replaced by the estimated value in the past. Therefore, it is worth observing whether the expected statistical data can improve the model effect when establishing and verifying the model. Gao Dun Online School specially reminds: Candidates who have registered for the 20 13 futures qualification examination can effectively follow the review plan! In addition, the 20 13 high-definition course of Gao Dun online school futures career guidance has been opened. Through targeted explanation, training and answering questions, tracking, analyzing and guiding the whole learning process can help candidates improve the preparation effect in an all-round way.