My experience with Impact factors, or databases in general, is that they dilute the specific to the general. While a general trend is fine to learn the game, once you get to that plateau you have to have the specific to differentiate you from the crowd.
I tend to follow tracks that fall outside of these generalities just for the fact that, in studying the general, the specifics are lost. It has worked well for years as race track "foot prints" are not only specific, but they respond to their own unique variations.
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"If this world is all about winners, what's for the losers?" Jr. Bonner: "Well somebody's got to hold the horses Ace."
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