rownames,x1,x2,x3,x4,y
1,7,26,6,60,78.5
2,1,29,15,52,74.3
3,11,56,8,20,104.3
4,11,31,8,47,87.6
5,7,52,6,33,95.9
6,11,55,9,22,109.2
7,3,71,17,6,102.7
8,1,31,22,44,72.5
9,2,54,18,22,93.1
10,21,47,4,26,115.9
11,1,40,23,34,83.8
12,11,66,9,12,113.3
13,10,68,8,12,109.4