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As a foreigner, I picked Independent and got a score of -1% for Democrat and -20% for Republican.
Why is a large underestimate plus an equally large overestimate the same as two perfect estimates? I.e. shouldn't it sum the absolute errors?
I think a -20% means that you think Republicans are more moderate than they actually are.
Their choice of how to present positive/negative is actually pretty confusing and I wish they had chosen a more intuitive approach.
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I think it's trying to measure how extremely partisan you view each side, so averaging out an overly extreme perception with an underly extreme perception makes sense.
Using absolute values would give an interesting measure of how precisely you understand each side.
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