With inspiration from several of the other RotoViz writers, and based on some work that I posted yesterday, I created a very simple Explosion Index. As I discussed yesterday, there are probably about two primary components of athleticism in the Combine measures. There is the agility component, which probably should include the Shuttle, 3 Cone and 40. Then there is the explosion portion of the drills, which should include the 40, Broad Jump and Vertical Leap. I think it’s reasonable to include 40 time in both indices because 40 time is the drill that crosses over in terms of correlation. I’m also adding weight to the index, as weight correlates with things like 40 time and the 3 Cone. Because it might look like I’m trying to do some double counting here, let me just say that I think the value of the compositing of these measures is to overcome what are small samples in taking the measurements.
In the table below I’ve taken the prospects that we have measurements for (so excluding primarily Eddie Lacy) and standardized their measurements on the various tests so that we can get them into the same units. I don’t actually show the standardized scores except in the composite column, but the colored table should be your clue as to how each measurement stacks up in terms of being above or below the mean.
The Composite column is a simple averaging of the 4 measures that go into the Explosion Index. You can actually read that number as being X number of standard deviations above or below the mean (averaged for the 4 measures). There is no weighting taking place because I haven’t backtested this at all to see if any weighting should take place. Because no backtesting has taken place, I’m also not ready to say anything like “The players at the top are good and the players at the bottom are bad.”
|Christine Michael-Texas A&M||220||4.54||43||125||1.51|
|Michael Ford-Louisiana State||210||4.50||38.50||130||1.40|
|Cierre Wood-Notre Dame||213||4.56||37.50||124||0.76|
|Kerwynn Williams-Utah State||195||4.48||35||118||0.34|
|Giovani Bernard-North Carolina||202||4.53||33.50||122||0.26|
|Joseph Randle-Oklahoma State||204||4.63||35||123||0.21|
|Matthew Tucker-Texas Christian||221||4.55||35.50||118||0.20|
|D.J. Harper-Boise State||211||4.52||33.50||120||0.17|
|Mike James-Miami (FL)||223||4.53||35||115||0.01|
|Le’Veon Bell-Michigan State||230||4.60||31.50||118||-0.41|
|Theo Riddick-Notre Dame||201||4.68||32||118||-0.57|
|Robbie Rouse-Fresno State||190||4.80||34||114||-0.92|
|Zach Line-Southern Methodist||232||4.77||30.50||111||-1.42|
Just in case you’re wondering what the scores of some running backs already in the NFL look like, here is a table which has some select names that I think you’ll find interesting.
|David Wilson-Virginia Tech||70||206||4.49||41||132||1.25|
|LaDainian Tomlinson-Texas Christian||70||221||4.46||40.50||NA||1.15|
|Joseph Addai-Louisiana State||71||214||4.40||38.50||125||1.05|
|Ryan Mathews-Fresno State||73||218||4.37||36||121||0.78|
|Andre Brown-North Carolina State||73||224||4.37||37||115||0.71|
|Robert Turbin-Utah State||70||222||4.50||36||122||0.62|
|Chris Johnson-East Carolina||71||197||4.24||35||NA||0.58|