Efficiency Ratings: Michigan St

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

Who had the better game? Using the above referenced formula player B, who hit five of eight shots and committed two turnovers registered a +20 efficiency total while Player A who missed 17 shots and had four turnovers had just a +11 rating.


Quinn Cook scored 19 points, but Okafor manhandled the post, finishing with 17 points and five rebounds to lead No. 4 Duke past No. 19 Michigan State 81-71.

Against the defending Big Ten tournament champs, the 6-foot-11 freshman -- who is already considered a lottery pick -- showed everyone he can post up, drive to the basket, spin away from defenders, back them down and draw fouls. He blocked two shots, had two steals and finished 8-of-10 from the field. Okafor even wound up surviving foul trouble thanks to his teammates' contributions.

Cook, Justise Winslow and Tyus Jones put the game away with a 13-3 run that extended Duke's 51-48 lead to 64-51 with 7:58 left in the game. Michigan State never led, and Duke (3-0) has trailed for just 18 seconds this season.

Duke topped 100 points in each of its first two games this season, the first time it had done that in consecutive games since 1997-98. If the Blue Devils' big three keep playing this way, they could be one of the nation's highest-scoring teams. Cook was 7-of-12 from the field, Jones 4-of-5 and Okafor 8-of-10 -- a combined 61.3 percent. But the rest of the team was 8-of-23, numbers that must improve if Duke plans to return to Indy for the Final Four in April.


(change from previous game)
  • Jahlil Okafor +21 (-5)
  • Justise Winslow +13 (-8)
  • Tyus Jones +22 (+12)
  • Quinn Cook +24 (+3)
  • Rasheed Sulaimon +0 (-5)
  • Amile Jefferson +7 (-15)
  • Grayson Allen +0 (-10)
  • Matt Jones +2 (-10)
  • Semi Ojeleye +1 (-3)
  • Marshall Plumlee +2 (-8)

Notes: When their first option got sidelined with foul trouble, Duke rebounded behind a pair of point guards. Tyus Jones and Quinn Cook both played a nearly flawless game against the Spartans, combining for a +46 rating overall and keeping the Blue Devils afloat. Jones shot 4-of-5 from the field and hit all seven free throws. Cook shot 7-of-12 hit both of his charity stripe attempts. The duo also combined for 10 assists and zero turnovers.

Meanwhile Duke didn’t get an overly efficient performance from Winslow who shot just 4-of-11 from the field, but managed six rebounds and three assists which offset two turnovers and a low field goal percentage. The freshman was also the high minute player along with Cook, playing 36 of the 40.

As for Okafor, he continues to be the definition of efficient. The freshman big man shot 8-of-10 (and has missed just five of his 30 FG attempts this season), but didn’t rebound especially well (5 in 30 minutes) and got hit with three turnovers. Despite the dings in the equation, Okafor still scored over +20.


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

Ten Most Efficient Performances

  • Jahlil Okafor v. Presbyterian (+28)
  • Quinn Cook v. Michigan St (+24)
  • Tyus Jones v. Michigan St (+22)
  • Jahlil Okafor v. Fairfield (+22)
  • Amile Jefferson v. Fairfield (+22)
  • Grayson Allen v. Presbyterian (+22)
  • Tyus Jones v. Presbyterian (+21)
  • Jahlil Okafor v. Michigan St (+21)

Five Least Efficient Performances*

  • Marshall Plumlee (+0) v. Michigan St
  • Rasheed Sulaimon (+0) v. Michigan St
  • Semi Ojeleye (+4) v. Fairfield
  • Semi Ojeleye (+5) v. Presbyterian


Cumulative Season ratings for the Blue Devils. (E/game)*
  • Jahlil Okafor +71 (23.7)
  • Quinn Cook +65 (21.7)
  • Tyus Jones +53 (17.7)
  • Justise Winslow +47 (15.7)
  • Amile Jefferson +40 (13.3)
  • Grayson Allen +32 (10.7)
  • Marshall Plumlee +27 (9.0)
  • Rasheed Sulaimon +25 (8.3)
  • Matt Jones +23 (7.7)
  • Semi Ojeleye +11 (3.7)

Games Factored In: N/A


Cumulative Season ratings per minute for the Blue Devils. (E/minutes)
  • Grayson Allen: 1.000
  • Jahlil Okafor: 0.888
  • Quinn Cook: 0.739
  • Marshall Plumlee: 0.692
  • Tyus Jones: 0.688
  • Amile Jefferson: 0.656
  • Justise Winslow: 0.610
  • Rasheed Sulaimon: 0.521
  • Matt Jones: 0.426
  • Semi Ojeleye: 0.344


Tracking the most and least efficient performances by player
  • Jahlil Okafor 28 / 21
  • Justise Winslow 21 / 12
  • Tyus Jones 22 / 10
  • Quinn Cook 24 / 20
  • Rasheed Sulaimon 20 / 0
  • Amile Jefferson 24 / 7
  • Grayson Allen 22 / 0
  • Matt Jones 14 / 2
  • Semi Ojeleye 5 / 1
  • Marshall Plumlee 17 / 2


- Okafor and Cook have been Duke’s best rotational players for the season. It’s not surprising to see the big center near the top of the list, but a shooting guard rating over +20 in three straight games and being the second highest rotational player on the list is truly a testament to Cook’s improvement during the first three games of his senior campaign.

- The four players most likely to be on the court when the game counts are Okafor, Cook, Tyus Jones, and Winslow. Jefferson is the fifth starter, but only played 21 minutes against the Spartans.

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