rolling average的用法和樣例：
例句
- In order to measure seasonal variation we typically use the ratio-to-moving average method.
為了度量季節變動，我們通常使用移動平均比率法。 - Lastly, the paper presents the fractional differenced noise model and the autoregressive fractional integrated moving average model.
接著給出能描述長記憶性的分數差分雜訊模型和分整自回歸移動平均模型。
