. Author manuscript; available in PMC: 2008 Sep 1.

Published in final edited form as: Contemp Clin Trials. 2007 Feb 27;28(5):638–646. doi: 10.1016/j.cct.2007.02.003

Table 1.

Relative efficiency of the paired 2 × 2 crossover design.

σ₁_A_,2_A	σ₁_A_,2_B	RE_P_,_I	σ₁_A_,2_A	σ₁_A_,2_B	RE_P_,_I
0	0	1.00	0.40	0	5.00
0.1	0	1.25	0.40	0.1	2.50
0.1	0.1	1.00	0.40	0.2	1.67
0.2	0	1.67	0.40	0.3	1.25
0.2	0.1	1.25	0.40	0.4	1.00
0.2	0.2	1.00	0.50	0.1	5.00
0.3	0	2.50	0.50	0.2	2.50
0.3	0.1	1.67	0.50	0.3	1.67
0.3	0.2	1.25	0.50	0.4	1.25
0.3	0.3	1.00	0.50	0.5	1.00