New DFF Pre-Draft Dynasty Rookie Rankings

Dynasty Football Fan has completely revamped it’s rankings page and it starts with all new pre-draft dynasty rookie rankings.  You can find the Top 50 rookie list, including IDP, right here.  At DFF, we utilize what we like to call the Quad Score.  The Quad Score looks at the 8 metrics that NFL scouts evaluate for NFL prospects, including height, weight, 40-time, bench press, vertical leap, broad jump, shuttle run and 3-cone drill.

Of course, for a variety of reasons not everyone does each drill, so my method is to always take the metric from the combine unless it is not available, then I go to the pro-day metric.  If a drill was not performed by a prospect that portion of the Quad Score is made to zero, so it has a neutral impact on Quad Score results.

Once I have scores for all 8 metrics, I find the z-score for each metric by position.  Z-score is a statistical measurement of a score’s relationship to the mean in a group of scores.  You can learn more about z-score here if you’d like.  What this means is that each score is normalized so that a positive score is greater than the mean and a negative score is less than the mean.  So, when we compare across measures by z-score, the higher the number, the better the score and vice versa. This makes it very easy to compare athleticism across athletes both in the current class and in past classes.  If your Quad Score is greater than zero you are more athletic than the average athlete and when your Quad Score is less than zero you are less athletic than the average athlete.

When the z-score for each metric is created I do one more thing, I calculate the speed score for each player and create the z-score for speed score.  Speed score helps put 40-time into perspective by incorporating weight into the equation.  Once we have all of these speed scores and z-scores calculated I pull them together in what I like to call Quad Score.  The Quad Score is four combinations of z-scores that add up to a sum total score and measure what parts of that sum score are deficient vs. proficient.  The four combinations are:

Speed = z-score of the speed score (which again, also incorporates weight)
Agility = z-score of the shuttle run and 3 cone drill
Leg Power = z-score of the vertical leap and broad jump
Arm Strength = z-score of the bench press

The Quad Score does not incorporate height, which is the only metric it does not include.  Once all of this is calculated, add up the four scores for a total Quad score.  The higher the total score, the more athletic the prospect of course, though that does not tell the whole story.  by segmenting the metrics into four distinct types we’re able to see what each prospect excels at and what may be a weakness.

Now, you have to understand what the Quad Score can’t tell us.  Especially when you’re looking at combine and pro day information.  At the combine and pro days we measure prospects athleticism.   Athleticism doesn’t translate to the field when it’s not combined with football intelligence, field vision and spacial awareness on the part of said prospect.  It also won’t translate when you don’t have scheme fit, coaching fit and an available starting spot on the depth chart.  Therefore, in our rankings you will see low Quad Scores higher on the list and vice versa because we recognize this is only one measure of evaluation, though one that projects much of the potential of an NFL prospect.

Enjoy the rankings!

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