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The 2013 NFL Season
As promised, here is the 2013 season update. In order to shed more light on my methodology, I will breakdown the rankings and win-loss records at a team level below, so we can see exactly how right (and wrong) each ranking system was.
As a reminder, I am looking at the rankings after week 4 of the regular season, and seeing how those correlate to each team's win-loss record for weeks 5-16. The ranking systems I'm comparing are: the ESPN power rankings, Football Outsiders' DVOA Rankings, the Advanced NFL Stats team efficiency model, my betting market rankings, and the Simple Ranking System.