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Elo ratings are a little different, however. Instead of being designed to maximize predictive accuracy — we have FPI for that — they’re designed to mimic how humans rank the teams instead.4 Their parameters are set so as to place a lot of emphasis on strength of schedule and especially on recent "big wins," because that’s what human voters have historically done too.

Here’s How Our College Football Playoff Predictions Work | FiveThirtyEight

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