study	t1	t2	t3	r1	n1	r2	n2	r3	n3
AITIA	C	D		1	21	6	19
Swedish Coop	A	C		49	75	69	75
Canndian Coop	A	B		13	57	11	51
Danish   Coop	A	C		2	24	4	26
Danish Low dose	C	D	B	18	54	5	30	34	78
Reuther	A	B		2	30	6	30
UK TIA	A	C		2	30	4	30
SALT	B	C	D	6	30	4	30	12	23
AAASPS	C	D		16	28	18	36
CARRIE storke	A	C		6	20	5	20
TASS	A	B		1	48	3	50
lI	A	C		8	35	9	35
ZHU	A	D		8	35	7	35
HA	C	D		9	35	7	35
LIU	C	D		13	20	12	20
LIU	C	A		13	20	10	20
LIU	D	A		12	20	10	20

问STATA如何将多臂配对转化为长数据啊