rsid SNPid AlleleA AlleleB
1 1 A T 0
1 1 A T 1
1 1 A T 0
1 1 A T 1
1 1 A T 0
1 1 A T 0
...
...
...
2 2 C G 1
2 2 C G 0
2 2 C G 0
2 2 C G 0
2 2 C G 1
2 2 C G 0
想新生成变量 m1 and m2。rsid=1时 ,m1重复 1 to 3, m2 每隔观测加1。rsid=2时,m1还是重复1 to 3,m2 从10开始,然后也是每隔三个观测加1;
rsid SNPid AlleleA AlleleB m1 m2
1 1 A T 0 1 1
1 1 A T 1 2 1
1 1 A T 0 3 1
1 1 A T 1 1 2
1 1 A T 0 2 2
1 1 A T 0 3 2
...
...
...
2 2 C G 1 1 10
2 2 C G 0 2 10
2 2 C G 0 3 10
2 2 C G 0 1 11
2 2 C G 1 2 11
2 2 C G 0 3 11