Table 2. Simpson's paradox (synthetic data).

Two treatments (A and B) were applied in two groups (1 and 2) of patients. Treatment A seems to be more successful in each of the groups viewed separately (100 > 87.5 and 66.7 > 50). However, evaluated for the combined group of patients, treatment B appears to be more successful (75 < 80).

		Treatment A			Treatment B
	Success	Total	Percentage	Success	Total	Percentage
Group 1	15	15	100%	105	120	87.5%
Group 2	30	45	66.7%	15	30	50%
Combined	45	60	75%	120	150	80%