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? Regards S.

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?

I used a -4 too +4 Likert scale in one set of questionnaires and -3 too +3 for the same questionnaires, but gathered respondents in a different way. I want to rescale from -4 too +4 down to -3 too +3 for the second group. How do I do this and secondly is there a referenced/accepted procedure for doing this? Regards S.

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? Regards S.