How do I choose which confident interval for proportion difference to use in SAS? In SAS, there are different CIs for proportion difference ($\pi_1-\pi_2$) to choose?
1.Continuity-corrected Wald CIs based on  normal approximation
2.exact method
3.Miettinen-Nurminen CIs based on score test
4.Newcombe hybrid score CIs based on Wilson score CIs for binominal proportion

There are a lot of intervals out there for the binomial proportion. This paper does a fairly good job of comparing some of them on coverage and length (typically, you want coverage closest to nominal with smallest length.  Shorter intervals are higher precision so close to nominal coverage and short length is desirable).
The paper linked does not compare those exactly, but should be sufficient to get you started.
