How do you get a confidence interval for an odds ratio between two different groups (both of which are not the reference group) in SAS?
Suppose $x_1$ is the reference level and $x_2,x_3,x_4$ are the other variables. Odds ratios in SAS give them for each level compared to the reference (e.g. $x_2$ vs $x_1$, $x_3$ vs $x_1$ etc..). How do you get the odds ratio between $x_2$ and $x_3$ in SAS including confidence intervals?