A couple options. One would be to specify a range of (r0-1) for the multiple response item--that would allow the subject to click continue without choosing a response. Another option would be to use (r1-1) and simply offer an option such as "I'd like to skip this question". The latter solution might also serve as a work-around for scale responses.
Hope that helps!
key words: non-response, skip response, allow no response for scale response




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