指数平滑法是预测中的重要方法，本代码实现了，二次指数平滑法预测 ,Exponential smoothing is an important means of prediction, the code, and the second exponential smoothing forecast

包含二次及三次指数平滑算法程序，预测程序示例所用为二次指数平滑算法，若需是三次平滑，替换相应部分程序即可-Includes secondary and smoothing algorithm procedures, the three indices to predict the sample used in the program for the second exponential smoothing algorithm For the three smooth, replace the c