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The question mark is just being used to avoid using words like "no
opinion" or "neutral", presumably assuming that most foks would make a
reasonable interpretation. Actually, the terms used in a scale of
responses is more a language comprehension issue than a statistics
issue. As far as the question mark being ambiguous, I think that is
intentional. "Neutral" and "No opinion" and "Don't care" all are rather
ambiguous, but ? catches the sense well, IMO.
Dick
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n:Beldin;Richard
tel;home:787-255-2142
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title:Professional Statistician (retired)
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