经典时间序列之加法模型:The additive model of the classic time series: 因经典时间序列中加法模型（1-4步与乘法模型一样所以从第五步开始写）The additive model of the classic time series (Step 1 - 4 are the same with the Multiplicativemodel, so is starting to write from step 5) 第五步：趋势变化因为是加法模型所以，计算剔除季节性变化的公式为（round(sales-seasonal index,2)的出来的。Step 5: Trend v...
