我有一个 Fantasy Football 统计数据集，我用来自学 R。数据是年度球员 Fantasy Football 以下是其格式的示例。
| x | Year| Player | TM | *Pos*| Age |*FantasyPts*|
| 1 | 2019| *J.Jones* | ATL| WR | 29 |100 |
| 2 | 2018| *J.Jones* | ATL| WR | 28 |101.3 |
| 3 | 2019| *A.Rogers* | GB | QB | 30 |500 |
| 4 | 2017| *A.Peterson*| TM | RB | 29 |12 |
What I want to do is summarize the player data as a whole. So for example summarize the two years together of *J.Jones* to be as follows.
| Player | *Pos*| *FantasyPts*|
| *J.Jones* | WR | 201.3|
Any thoughts?