rolling average的用法和样例：
例句
- In order to measure seasonal variation we typically use the ratio-to-moving average method.
为了度量季节变动，我们通常使用移动平均比率法。 - Lastly, the paper presents the fractional differenced noise model and the autoregressive fractional integrated moving average model.
接着给出能描述长记忆性的分数差分噪声模型和分整自回归移动平均模型。
