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I am working with a survey scale that is from -3 to 3. I have a mean value of .94 and I want to identify if there are ceiling effects, but I need to change the entire scale to 1-7 in order to understand what the effects are (which I want to do by taking the mean value and dividing it by the total score possible score).

But I'm guessing I can't just do .94/3 because in reality, it's a 7 point scale and not a 3 point scale (for example, what would happen if the mean was negative?).

Any ideas?

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    $\begingroup$ Why not just add four? $\endgroup$ – The Laconic Feb 26 at 1:54

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