Nate Silver of fivethirtyeight.com introduces us to his new Partisan Propensity Index (PPI) to predict which way an open House seat will fall in a midterm election.
At least that's what I think it predicts. I'm always amazed at Silver's ability to crunch numbers and I generally digest them pretty well but this new index makes me wish I did better than a B+ in College Statistics.
Blue Jersey has a pretty good explanation of Nate Silver's new metric and how it impacts Congressional races specifically in New Jersey.
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