At the moment I do not have access to Pro Football Focus premium stats. But when I did, one of the things I noted was that some QBs are much more affected by pressure than others. If you look at QB ratings with and without pressure, guys like Manning, Brady, and Roethlisberger are very cool under pressure. Their passer ratings hardly change at all. You look the average NFL QB, and his productivity will drop by 30 to 40% when under pressure.
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