Norvigs claim can quite probably be credited to selection bias. See http://erikbern.com/2015/04/07/norvigs-claim-that-programming-competitions-correlate-negativ

Norvigs claim can quite probably be credited to selection bias. See http://erikbern.com/2015/04/07/norvigs-claim-that-programming-competitions-correlate-negatively-with-being-good-on-the-job/ http://erikbern.com/2015/04/07/norvigs-claim-that-programmin... for some nice graphs.