When I try to run two iif statements between fields I get a -1 instead of 1. The statements work fine by themselves.
Inactive and Opted-in 2: IIf([enrollment status 2012] Is Null And [enrollment status 2013]="opt-in","1",Null) Or IIf([enrollment status 2012]="opt-out" And [enrollment status 2013]="opt-in","1",Null)