说明：  根据数据作图，采用时序图检验和自相关图直观判断序列是否平稳，利用LB统计量检验时间序列是否为纯随机性序列
(According to the data mapping, we use the time sequence diagram test and autocorrelation diagram to directly judge whether the sequence is stable, and use the LB statistics to test whether the time sequence is a pure random sequence)