id    is_sample    population    time
0     0    0        6.0
1     0    0        2.0
2     0    0        2.0
3     0    0        2.0
4     0    0        2.0
5     0    0        1.0
6     0    0        1.0
7     0    0        1.0
8     1    0        0.0
9     1    0        0.0
10    1    0        0.0
11    1    0        0.0
12    1    0        0.0
