线性回归预测模型是应用线性回归技术，根据历史数据建立回归方程．用此回归方程进行超前预测。然而，建立了一个线性回归模型能否用其做无限期的超前预测呢？显然，一个预测模型的预测精度随着超前期的增加而逐渐降低，即预测误差越来越大。当外推至某一期时，预测误差之大， Linear regression prediction model is the use of linear regression techniques, based on historical data to establish regression equations. Use this regression equation to predict ahead of time. However, the establishment of a linear regression model can be used to do it indefinitely ahead of the forecast? Obviously, the prediction accuracy of a prediction model gradually decreases with the increase of the lead time, that is, the prediction error is getting larger and larger. When extrapolating to a certain period, the prediction error is large,