Is there a simple method to select an alternate from a Roster? For example, if i use the standard random selection from a roster, and find out the individual isn’t available, how can i select an alternate from the same roster?
David, recall that the whole purpose of random selection is to prevent the interviewers from interviewing a “convenient” person, and yes, in most protocols they will need to return to the household at agreed hour if randomly selected member is not available.
If you still insist that you want to delegate this decision to the interviewers, you can exclude the non-available member from members eligible for selection: Selectable person is then person who is Eligible and Available.
Make sure you record this fact in a question “Is %rostertitle% available for the personal interview? Y/N”.
Hope this helps, Sergiy