Efficiency Ratings: N. Carolina

Using an NBA Efficiency Rating Formula, TDD tracks the best statistical performances of the season

A quick way NBA coaches measure a player's game performance is by evaluating his efficiency. In order to find a player's efficiency the following formula is used:

((Points + Rebounds + Assists + Steals + Blocks) - ((Field Goals Att. - Field Goals Made) + (Free Throws Att. - Free Throws Made) + Turnovers)).

For example, compare the following stat lines:

Player A: 17 points (5-of-22 FG, 7-9 FT), 8 rebounds, 6 assists, 3 steals, 4 turnovers.

Player B: 15 points (5-8 FG, 3-4 FT), 4 rebounds, 7 assists, 2 turnovers

Latest Game:

Back and forth they went, trading big leads, shots and chances to win both in regulation and overtime.

And then the No. 4 Duke Blue Devils found a way to send their fierce neighborhood rivals home empty again.

Quinn Cook scored 22 points, freshman Tyus Jones matched a season high with 22 and Duke outlasted the No. 15 Tar Heels 92-90 on Wednesday night.

In a thriller befitting college basketball's most intense rivalry, the Blue Devils (23-3, 10-3 Atlantic Coast Conference) let an early 13-point lead slip away and trailed by 10 with less than four minutes left in regulation before rallying for their sixth straight win this season, and their ninth in 12 meetings in the series.

The three freshmen who start for Duke had their customary big games: Jones added eight assists, Justise Winslow added 16 points and Jahlil Okafor had 12 points and 13 rebounds.

Kennedy Meeks and Brice Johnson each scored 18 points to lead North Carolina (18-8, 8-5). Nate Britt pulled the Tar Heels within two with one free throw with 3.5 seconds left. He missed the second, Marcus Paige raced in and got his hands on the rebound -- but Winslow grabbed it as the buzzer sounded.

vs. DUKE

(change from previous game)
  • Jahlil Okafor +15 (-12)
  • Justise Winslow +18 (+3)
  • Tyus Jones +22 (+7)
  • Quinn Cook +16 (—3)
  • Amile Jefferson +20 (+19)
  • Grayson Allen +0 (-8)
  • Matt Jones +10 (+2)
  • Marshall Plumlee +2 (-)

Notes: Leading into the game the X-factor was thought to be Jefferson who came through in a big way for the Blue Devils. The junior posted a +20 thanks a career best six blocks to go along with 13 points and five rebounds…Jefferson also shot 5-of-7 from the field, but just 50 percent from the line. Still, it was - by far - the best game the junior has played in quite a few weeks.

The brilliance of Jones and Cook was somewhat lost on the formula as Jones’ +22 was a high score, but was lowered dramatically by his career worst six turnovers. Meanwhile, Cook’s 1-to-1 assist to turnover ratio was enough to pull down his score… At first glance it’s easy to blow off the rankings, but the ebbs and flows of the game were well captured in the box score with Jones’ turnovers and Cook’s neutral impact passing the ball.

Meanwhile, Okafor posted his second lowest score of the season despite carding a double-double with 12 points and 13 rebounds. The biggest factors in his score dipping were the performance at the free throw line (0-for-6) and five turnovers.


Throughout the season TDD will track the various highs and lows using the formula.

Ten Most Efficient Performances

  • Jahlil Okafor v. Elon (+37)
  • Jahlil Okafor v. NC State (+33)
  • Jahlil Okafor v. Furman (+32)
  • Jahlil Okafor v. Boston College (+32)
  • Amile Jefferson v. Furman (+30)
  • Jahlil Okafor v. Wofford (+30)
  • Jahlil Okafor v. Toledo (+28)
  • Jahlil Okafor v. Presbyterian (+28)
  • Jahlil Okafor v. Notre Dame (+28)
  • Jahlil Okafor v. Notre Dame (+28)

Five Least Efficient Performances*

  • Rasheed Sulaimon (-6) v. Connecticut
  • Justise Winslow (-5) v. Miami
  • Rasheed Sulaimon (-4) v. Temple
  • Grayson Allen (-3) v. Boston College
  • Matt Jones (-2) v. Elon


Cumulative Season ratings for the Blue Devils. (E/game)*
  • Jahlil Okafor +571 (22.0)
  • Tyus Jones +399 (15.3)
  • Quinn Cook +383 (14.7)
  • Amile Jefferson +324 (12.5)
  • Justise Winslow +320 (12.3)
  • Matt Jones +149 (5.7)
  • Marshall Plumlee +127 (4.9)
  • Grayson Allen +53 (2.4)*

*- Games Factored In: Allen (22)


Cumulative Season ratings per minute for the Blue Devils. (E/minutes)
  • Jahlil Okafor: 0.711
  • Marshall Plumlee: 0.555
  • Amile Jefferson: 0.544
  • Tyus Jones: 0.478
  • Justise Winslow: 0.439
  • Quinn Cook: 0.414
  • Grayson Allen: 0.351
  • Matt Jones: 0.303


Tracking the most and least efficient performances by player
  • Jahlil Okafor 37 / 11
  • Amile Jefferson 30 / 1
  • Quinn Cook 24 / 6
  • Tyus Jones 27 / 1
  • Grayson Allen 22 / -3
  • Justise Winslow 27 / -5
  • Marshall Plumlee 17 / 0
  • Matt Jones 17 / -2


- Jones and Cook have separated themselves from the rest of the pack and it's now between the two point guards when deciding who will finish behind Okafor in the cumulative standings.

- Meanwhile, Jefferson and Winslow are still battling for fourth spot in what appears to be the most competitive placement remaining this year.

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