http://sports.espn.go.com/nfl/news/story?id=3337822
Ready for a math headache? The formula for the adjusted 40 score is (Weight * 200)/(40 Time4). The multipliers are as such in the formula to ensure both accuracy as well as simplicity -- the scores that result revolve around a 100-point scale. The average adjusted 40 score of all running backs is 98.5; for all drafted running backs, it's 102.4; for all running backs selected in the first round, it's 112.1. Consider adjusted 40 score to be a sort of speed score -- a higher number is better.
200a
____
b^4
Example. Rashard Mendenhall A=225 B=4.45
200(225)
________ = 114.6
4.45^4
Example. Reggie Bush
200(201)
________ = 105.3
4.42^4
What this formula is missing is height. If I had the source data (not impossible to compile) I would break down the heights by inches and adjust the scores. From that you could probably come up with a total speed/quickness score.
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