I have kind of the same question as above.
How should I distuiginish the answers that because of routing (if yes, go further with the next question) not have been filled in? So because of earlier questions, people couldnt answer this question. And how should I value questions that people left blank, but where they based on earlier question could have answered the question?
At the moment the 'does not apply' answers I left blank (space) en the really missing answers i defined as 999, and put it like this in the 'missing value' column in the variable view.
Anybody has a answer? Hope so! Anyway, thanks!