Before revision: Inference Risk difference can be estimated from a 2x2 contingency table: GroupExperimental (E) Control (C) Events (E) EECENon-events (N) ENCNThe point estimate of the risk difference is The sampling distribution of RD is approximately normal, with standard error The confidence interval for the RD is then where is the standard score for the chosen level of significance .
After revision: Inference Risk difference can be estimated from a 2x2 contingency table: GroupExperimental (E) Control (C) Events (E) EE CE Non-events (N) EN CN point estimate of the risk difference is The sampling distribution of RD is approximately normal, with standard error The confidence interval for the RD is then where is the standard score for the chosen level of significance The