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Jeromy Anglim
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How to rescale two questionnaires that use slightly different response scales in order to make them comparable?

I used a -4 to +4 Likert scale in one set of questionnaires and -3 to +3 for the same questionnaires, but gathered respondents in a different way. I want to rescale from -4 to +4 down to -3 to +3 for the second group.

How do I do this and secondly is there a referenced/accepted procedure for doing this?

hucsy
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