A Note on Exponentially Smoothed Seasonal Differences
论证了对季节性差分进行指数平滑可以简单有效地抑制短期波动（包括季节性波动），适用于需要过滤特定频率区间变化的经济时间序列分析。
Filtering economic time series can be justified if variations within a certain frequency interval are relevant for the problem at hand. It is shown here that exponential smoothing of seasonal differences provides a simple means of damping short oscillations, including seasonal ones.