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ciphergoth comments on Open Thread: March 2009 - Less Wrong
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Having a slider requires a more-sophisticated data analysis, because different people use different rating scales. Typically psychologists use a multi-point scale, then use Rasch analysis (also called multi-item response theory) on the data.
I would say from my experience that a 5-point scale is not big enough; almost everything gets 3 or 4 points, except from the people (about 2% of raters) who binarize the scale by giving everything either a 1 or a 5. Also, people will not use negative ratings, so don't try to center them on zero. People (or at least Americans) just can't say "zero is average".
Two things you could do about that:
As you hover over the rating button, the text below changes to indicate what that rating would mean. Zero stars means "don't bother", one star means "good enough to stay visible", two stars means "above-average" and so on
Allow half stars for more information.
We would use percentile score to make the best use of the votes of binarizing voters without giving them more influence than high-information voters.