Comparing current NFL draft prospects to those of years past is standard procedure in draft evaluation, though most comparisons are built on the memory recall and subjective opinion of the particular evaluator.
This will be the first in a series of articles comparing the 2021 draft prospects to prior years and picking out the most similar comps with a clearly delineated and quantifiable method.
PFF data scientist Eric Eager has done tremendous work building college-to-pro projections, which are built off the robust college data we’ve collected since 2014 and have been applied to exercises like building an “Analytics” Mock. In this analysis, I will use some of our advanced stats for comparison but primarily rely on traditional stats to go back further to compare the 2021 prospects to draft classes going back to 2006.
Without the NFL Scouting Combine this season, the important measurables like weight and 40-yard dash will be reported through the various pro days.
View PFF's 2021 NFL Draft position rankings:
The comps below were derived from a two-step process. First, I converted all the most statistically relevant stats and measurables to percentiles based on the thousands of prospects who have entered the NFL since 2006 at each position. Then, I filtered the total universe of past prospects by those who had draft positions, weight and 40 times within a 10th percentile in either direction of Jermar Jefferson. For undrafted players, I assigned a numerical draft position of 300.
The rest of the matching features were transformed by principal component analysis (PCA). I found the closest statistically comparable players by the euclidean distance between the players' principle components, listed in the top 10 below.
The metrics for PCA are: rushing attempts per game, rushing yards per game, rushing touchdowns per game, receptions per game and market share of team receptions. All of these data points come from the prospect’s best collegiate season. I also matched the prospect’s market share of total team yards and touchdowns to past draft prospects.
For Jefferson's draft position, I’m using an estimate based on the mock data collected at GrindingTheMocks.com. For the weight and 40 time, I’m using the numbers from his pro day, with a 0.03-second penalty added to the 40 time to reflect the uncertainty of pro-day timed measurements.
Most comparable players
Jefferson has the production profile we love to see from later-round running backs. He posted 1,527 scrimmage yards and 12 touchdowns as a freshman in 2018, continued decent production in his sophomore season and then returned with stellar play in 2020 with 925 scrimmage yards and seven touchdowns in only six games.
The Oregon State back is relatively young, at 21 years of age, and he is entering the draft as an early declare.
Unfortunately, his pro-day performance took some of the wind out of his sleeper sails. He ran a below-average 4.55-second 40-yard dash at a lighter 206 pounds and hit below the 25th percentile in the vertical, broad jump and three-cone.
On the field, Jefferson showed big-play ability that belied his workout metrics.
JERMAR JEFFERSON: HOME-RUN HITTER
— PFF Draft (@PFF_College) November 21, 2020
Jefferson's most intriguing comps lie near the bottom of his top 10. Aaron Jones and Ahmad Bradshaw combined for many years of fantasy relevance, with Jones ranking in the top five among running backs in PPR leagues in his third and fourth NFL seasons.