Observation,Y0,Y1,r0,r1,Y0_r0,Y1_r1,X
1,3,4,1,1,3,4,1
2,4,7,1,1,4,7,1
3,3,4,1,1,3,4,1
4,4,7,1,1,4,7,1
5,10,14,0,0,Missing,Missing,0
6,12,18,0,0,Missing,Missing,0
7,10,14,1,1,10,14,0
8,12,18,1,1,12,18,0