有一些列数
 | 销量1 | 销量2 | 销量3 | 销量4 | 销量5 | 销量6 | 
| 品类a1 | 2  | 3  | 4  | 5  | 6  | 7  | 
| 品类a2 | 3  | 4  | 5  | 8  | 10  | 15  | 
| 品类a3 | 5  | 6  | 9  | 12  | 15  | 7  | 
| 品类a4 | 4  | 3  | 4  | 5  | 7  | 7  | 
| 品类a5 | 8  | 7  | 8  | 5  | 6  | 7  | 
| 品类a6 | 3  | 5  | 4  | 5  | 6  | 7  | 
| 品类a7 | 2  | 3  | 6  | 5  | 7  | 7  | 
| 品类a8 | 2  | 3  | 4  | 5  | 6  | 7  | 
| 品类a9 | 4  | 3  | 6  | 4  | 7  | 7  | 
| 品类a10 | 1  | 3  | 4  | 5  | 6  | 7  | 
| 品类a11 | 2  | 1  | 4  | 4  | 6  | 7  | 
| 品类a12 | 4  | 3  | 4  | 6  | 6  | 8  | 
现在想做用曲线估计做个拟合,请问怎么才能把这些数据合并到一起,又可以区分出几类来?
不知道表述清楚没?