grouped frequency series

例句：

1. 1.The grouped frequency series is used to analyze the data.
   分组频率系列用于分析数据。
2. 2. The grouped frequency series helps us understand the trends in the market.
   分组频率系列帮助我们理解市场趋势。
3. 3. The grouped frequency series can be used to predict future events.
   分组频率系列可用于预测未来事件。